trek slash test 2023

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Field Test Review: 2024 Trek Slash - Rides Like a Session

Cool Features

TREK SLASH 9.9 X0 GEN 6 REVIEW

Words by Drew Rohde  |  Photos by Staff

After nearly six months of abuse, conversations with Trek Bikes HQ and a YouTube Service Bulletin video full of interesting comments, we’re kicking off the new year with a high pivot, Gen 6 Trek Slash review that should be another great conversation piece as one of the hottest bikes of 2023. We’ve been fans of many of Trek’s bikes over the last few years from the Session DH bike to their Fuel EX and Fuel EXe and of course, the last generation Slash . We first rode the Gen 6 Trek Slash during Crankworx Whistler, where we filmed a Dissected Feature with their engineer: Trek athlete Casey Brown and more. Since then, we spent the rest of summer in the bike park, pedaling backcountry trails and yes, filming a service video on the famous “Chain dropping” issue that commenters had us thinking was affecting nearly everyone who owned one of these bikes. But…as the saying goes, don’t believe everything you hear. Even if you don’t believe what we’ve got to say when it comes to the goods and bads of the new Trek Slash, we think you’ll find it entertaining at least.

QUICK SPECS

• 170mm High Pivot ABP Suspension • Mixed Wheel (29”F/27.5”R) as standard, dual 29” option • HTA 63.3 • STA 76 (effective) • REACH 490 (Large)

FULL BUILD SPEC

CHASSIS Frame: OCLV Mountain Carbon | 170mm Fork: RockShox ZEB Ultimate 170mm | Charger 3 RC2 Shock: RockShox Vivid Ultimate 230x65mm

COCKPIT Brakes: SRAM Code Silver | 200F/R Centreline rotors Bar/Stem: Bontrager RSL Integrated | OCLV Carbon | 820mm | 27.5mm Rise | 35mm Length Headset: Integrated Sealed Bearing Seatpost: RockShox Reverb AXS | S: 100mm, M-XL: 170mm Saddle: Bontrager Arvada

WHEELS Hubs: Bontrager Rapid Drive 108 Rims: Bontrager Line Pro Carbon Front Tire: Bontrager SE6 Team Issue | 29″ x 2.5″ Rear Tire: Bontrager SE5 Team Issue | 27.5″ x 2.5″

DRIVETRAIN Bottom Bracket: SRAM DUB Threaded Cassette: SRAM Eagle XS-1295 | T-Type | 10-52T Cranks: SRAM X0 Eagle | T-Type | 30T | 165mm length Shifter: SRAM AXS POD Ultimate | 12s Derailleur: SRAM X0 Eagle AXS | 12s

Downhill performance is incredible

Rear suspension plush yet solid

Fast and Confident

Bike Park shredder

Vivid Ultimate

WE DON’T

3 Dropped chains (fix appears to work)

Steep, chunky climbing

About The Trek Slash Gen 6

Packing 170mm of travel out back, the new Trek Slash claims to be a 70/30 bike, meaning Trek designed the bike to have a 70% downhill bias with a 30% nod to climbing and uphill capabilities. Needless to say, this isn’t your run of the mill XC or all-mountain bike. It’s designed and built for riders who prioritize downhill speed, composure, and confidence on the gnarliest terrain over efficiency and climbing performance.

Since this review is likely going to get a bit long, we’ll link to our Dissected Feature which has a written interview, all the tech details and a video interview and presentation on the Gen 6 Trek Slash. If you’d like to check that out, click here.

If the CliffsNotes version works for you then we’ll gloss over a few key features:

FRAME AND FEATURES

Updated for 2023, the high pivot Trek Slash Gen 6 can be run with a number of wheel size configurations and can take up to a 190mm travel fork but comes with a 170mm fork and mixed-wheel setup as standard. Riders can choose a full 29er race machine, 27.5” aggro-shredder or put a dual crown 190mm with a mullet and have a mini-Session bike park rig.

With many people loving the last generation Slash, some may have wondered why Trek opted to go to a high pivot and run two idlers? Well, with Trek’s other bikes creeping up in capability and riders wanting to go faster and bigger, it seems many brands are making their bikes bigger and burlier, and of course, more high-pivoty. Trek Slash engineer, Matt Yerke told us that even though the bike’s 70% focused on DH performance, they took time to keep it versatile and pedal-friendly, as a mountain bike should be. Did they deliver? We’ll see down below.

BUILD SPECS AND VALUE  

With bikes starting at $4,399 and going up to $11,499, our Slash 9.9 X0 AXS sits on the higher end of the spectrum at $9,399 and comes with a dialed spec. If we were spending our own money however, we’d likely be checking out the Slash 9 or Slash 9.8 XT models.

Chain Drop Service Bulletin and Notes from Trek

We published this How To Video to address some of the popularized videos and comments talking about chain drop on the new Trek Slash. After publishing this video and seeing all the comments, we reached out to Trek as it had us reconsidering our official stance on the long-term review you’re about to see below. The statement below from Trek, which we are taking as truthful, made us feel better and also aligned with our notions of what we’ve observed. Trek passed our concern around their Customer and Dealer Service teams and below is a small excerpt.

“First off, Trek Bicycles and I would like to acknowledge that it is frustrating to buy a nice new bike that doesn’t work exactly like it should out of the box. Luckily however, it has been a very small number of people affected and thankfully they have been far less upset than what online commenters may have you believe.

Trek’s customer service team has actually received way more calls about internet comments talking about chain drop than actual Slash owners who are experiencing the issue. We have found that a handful of riders said the fix did not entirely solve their dropping issues. We have sent out early units of our updated idler wheel to that handful of riders, one of which is Ryan Howard, who has been spending a ton of time on his Slash. We’ve been pleased to hear that those riders are no longer having any drop issues.

These will ship to dealers at no cost for any Slash owners who want to get one.” – Ross Rushin // MTB Product Manager

When evaluating the new Gen 6 Trek Slash 9.9 X0 AXS against the previous generation Slash and current offerings from other brands in this genre, the Slash commands attention. As with any purpose-built product, the things that make it excel can also alienate or turn off others. I’m traditionally not a huge fan of high pivot bikes, though I’ve grown to like mid-high pivot bikes for certain applications. Rocky Mountain’s Powerplay eBike and the Trek Session , which we reviewed last year, are two examples of mid-high pivot bikes that I like quite a bit.

Chances are you’ve already heard the touted claims of high pivot bikes since they’ve been so heavily marketed over the last couple of years, so we’ll save you the pitch. What is undeniable though, is that they can charge over terrain and obstacles a bit better than other designs, but only if they are tuned and designed well. We have ridden some high pivots that don’t really improve much, but suffer the downsides of a high pivot, but we’re happy to report that Trek has avoided this ill fate.

SETUP | Setting up The Trek Slash was one of the easier tasks of the year. It required almost zero tuning, customization or tinkering with to feel amazing. If you’ve read our older Trek reviews, you may recall us being a bit critical about the tune being a bit too mellow, which led to heavier or more aggressive riders needing to add maximum volume reducers or going our route, contacting Fox Shox to weasel a Trek Factory Racing tuned shock, which did wonders for the bike. This is no longer an issue as Trek seem to have finally identified that if they’re going to design an aggressive bike for aggressive riders, they need to have a shock and tune that are ready for it.

The most time-consuming part of our review bike’s set up was removing the one-piece Bontrager bar and stem combo unit and replacing it with our favorite OneUp Components Ebar and stem. This resulted in a better body position and way less hand fatigue.

DESCENDING | Trek has done a great job of making the new Slash’s suspension absolutely devour hits of all sizes. The RockShox Vivid Ultimate rear shock only compliments the insane capability of the Slash’s rear end. It is possibly the smoothest, best feeling rear suspension I’ve felt in a while. For me, a rider who loves smashing, gapping and floating rough, chunky downhill trails, it offers a very nice platform for support and control, but gets out of the way offering a bottomless and smooth feel. I could have been tricked into thinking a coil shock was mounted out back based on the composure and smoothness.

When it comes to downhill performance, the Trek Slash may be the best descending mountain bike we rode in 2023! It absolutely shreds trails with ease and begs to go faster. Whether we were lapping blown-out end of season bike park trails or remote backcountry downhills, the Slash leads the way. In fact, we can’t think of any bikes that aren’t downhill bikes that we’d want to ride in a bike park more than the Slash. The speed this bike carries, composure over braking bumps, big and little hits as well as the way it corners make it a really impressive machine.

The downside is, the compliance combined with the weight, makes this bike a little bit tougher to jib on smaller features at slower speeds. It absolutely still gets off the ground and is fun to play on, it just requires a bit more muscle to get it up and tweaked. Granted, this rocket ship wasn’t designed with lower speeds in mind, and it shows with a list of Personal Records that our various testers achieved.

Another downside is that the bike does have more stuff to go wrong. Whether you’re one of the unlucky riders dropping chains – which we did three times before the service bulletin addressed the issue – or not, more moving parts, extra chain links, and more nooks and crannies all mean more chances for things to go wrong.

CLIMBING | Along with the above concerns, the climbing performance of the Gen 6 Slash certainly isn’t what its outgoing sibling offered. Since taking possession of the Trek Slash 9.9 XO AXS we’ve had four riders put time on it. Two of which owned previous generation Trek Slashes. All riders agreed, like Trek claims, this bike is a definite 70/30 bike, and the climbing performance is tolerable in certain situations like fire roads and smoother trails, but can be a struggle on more steep, technical trails with larger obstacles that want to eat your momentum.

The weight is noted, and while the drag may be a claimed 3%, it felt a bit closer to 10% in practice. That could be exacerbated by the lengthening rear end – yes, the same thing that makes high pivots so great, also works against it.

It’s been a while since we graduated but, we think someone smart once said something about actions having reactions, but we didn’t pay close attention in school so maybe we’re making it up. Either way, when speeds are low, the grade steep and effort high, we found that the rear end could “stall” as we tried to pedal over roots or rocks, sucking our energy and momentum in the process. Much the way the rear end grows to get up and out of the way of an impact while descending, as you climb and hit an obstacle, the front continues to creep up the hill as you grind away at the pedals. However, the rear wheel goes backwards before going up and that delay can make it feel like you’re pedaling harder to get up and over that obstacle, which means more energy and slower times. Of course, this bike wasn’t designed to race up the hill, it’s meant to go down. If your energy is spent on the way up, however, it could be worth considering you may be more fatigued when that race timer starts.

FINISH AND VALUE | Now, as amazing as the bike is, we did in fact drop the chain three times over the six-month test period we had. Since the repair, we didn’t drop the chain, however we only had a few rides on it before winter hit, so we can’t say with 100% confidence it’s gone, but we are pretty certain that with the updated spacing and especially the new idler wheel, we’d be in good shape. You may want to wait until the updated idlers hit, hopefully February of 2024, but in the meantime the chain dropping issue may not be quite as bad as commenters may have you believing.

The rest of the bike is a nicely put together package. Trek paint had some years known for being a bit, soft we’ll call it, and while it’s still not as durable as we’d like, it’s a lot better. Though we’d recommend a frame wrap, of course, we’d recommend that on any bike, so maybe not a surprise there. If you stop, look closely and examine the details of this bike, it does look very nice, has quality bits, nice hardware and a very classy overall appearance. Trek have done a nice job making this a drool-inducing bike.

The Wolf’s Last Word

Price: $9,399 Weight: 36.4lbs Website: Trekbikes.com

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2023 Trek Slash 9.7 Review

Are you looking for a lightweight, full-suspension mountain bike capable of taking on some of the toughest terrain? Then you need to check out the 2023 Trek Slash 9.7.

The Trek Slashed 9.7 is one of the most sought-after and popular mountain bikes on the market today, with an exceptional variety of features and technology for both comfort and performance.

It boasts 230mm x 62.5mm of rear travel alongside a 170mm-travel Fox Rhythm 36 fork and Shimano Deore XT/ SLX drivetrain parts to keep your gears shifting smoothly and quickly out on the trail.

Reliable traction is also provided by its 29-inch wheels, while it’s top-of-the-line frame construction helps ensure stability and sturdiness in all terrain — even when dealing with rough trails, dips, jumps, and rock gardens.

So why should you consider investing in the 2023 Trek Slash 9.7? Read our review below to find out!

If you’re looking for a bike that can take you on the toughest trails and deliver a smooth ride, then look no further than the Trek Slash 9.7.

This full-suspension mountain bike delivers on power and performance, complete with versatile components that give you greater maneuverability when you take on hilly terrain or technical sections. 

The 2023 Trek Slash 9.7 is an excellent full-suspension mountain bike for taking on technical descents, enduros and challenging terrain.

Featuring a combined 160mm of travel, this bike gives you confidence to take on anything that may lie ahead.

It’s equipped with all the latest technology, including a Shimano XT 1×12-Speed drivetrain, Shimano 4-piston hydraulic disc brakes for reliable stopping, Fox suspension components, plus powerful Bontrager Line Comp 30 wheels wrapped in Bontrager XR5 Team Issue tires for superior traction.

When it comes time to hitting those big jumps and drops you can rely on the Trek Slash to get you through it all safely.

-OCLV Mountain Carbon main frame & stays, internal storage, tapered head tube, Knock Block 2.0, Control Freak internal routing, Carbon Armor, threaded BB, magnesium rocker link, Mino Link, Boost148, 160mm travel

-Fox Rhythm 36, Float EVOL air spring front fork with GRIP damper, tapered steerer, Boost110, 15mm Kabolt axle, and 170mm of travel

-Fox Performance Float X rear shock with 2-position damper, 230mm x 62.5mm

-Shimano XT 1×12-speed drivetrain featuring a 10-51t cassette paired to a 30t chainring guarantees optimal shifting performance

-Shimano 4-piston hydraulic disc brakes provide powerful stopping power

-Bontrager Line Comp 30 rims with XR5 Team Issue 29″x2.50″ tires guarantee superior grip and traction

The Trek Slash 9.7 comes fully equipped with an OCLV Mountain Carbon main frame & stays, providing you with a lightweight yet sturdy base for taking on fast descents and climbs.

The frame’s geometry is designed for aggressive trail rides, ensuring better handling when tackling steep drops and difficult features.

With 230mm x 62.5mm rear-wheel travel and 170mm front-wheel travel, this bike offers immense capability in the most challenging terrains thanks to its Fox suspension system.

So whether it’s jumps in a pump track or rock rollers during an all-day outing, you’ll have all the shock absorption needed while keeping weight distribution perfect at all times.

The Shimano XT 1×12-speed drivetrain components provide reliable performance and shifting precision every time you ride it, giving you quick access to gears when negotiating varying terrain types.

It also comes fitted with Shimano 4 piston hydraulic disc brakes for maximum stopping power.

The wheelset features 29 x 2.50 XR5 Team Issue tires mounted on Bontrager Line Comp 30 wheels that offer superior grip regardless of the terrain type or weather conditions, along with 15×110 thru-axles which keep wheels securely attached without compromising agility on technical trails.

If you’re after a trail bike designed for having maximum fun out in challenging places, then the 2023 Trek Slash 9.7 is certainly worth considering! 

With its lightweight frame built from quality materials plus an excellent suspension system featuring Fox shocks at both ends, this is a ride that will have your adrenaline pumping as soon as you hit those wild tracks!

Order online and have it shipped to your local dealer for final assembly!!

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• Rider Notes

2023 Trek Slash 8 Gen 5

A 29″ aluminum frame full suspension enduro bike with high-end components. Compare the full range

Manufacturer Price

Slash 8 Gen 5

In Stock: MD/LG & XL

For This Bike

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Based on frame geometry and build specs.

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

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Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Compare the full Slash model range

A great excuse to make poor choices

Read Review

Jan 2024 · Steve Fisher

Trek gives the 2024 Slash a high-pivot linkage with 170mm travel and mixed wheels, making a capable and well-rounded long-travel bike.

The 2024 Trek Slash looks nothing like the old one. So how do all the changes play out on the trail? Read on for our Trek Slash review.

Incredible composure on the rowdiest terrain

Plush & well-controlled suspension

Surprisingly efficient pedalling performance

Mullet setup injects welcome agility

Loads of in-built adjustability

Extra pulleys add complexity & noise

Tyres too flimsy for the application

Downtube storage is on the small side

Chainstay armour lacks damping

GX derailleur clutch failure

Oct 2023 · Dario DiGiulio

Trek did a very good job making the Slash a quiet bike, then seemingly lost the plot when they specced a hard rubber chainslap protector that does little to mitigate the drivetrain noise in bumpy terrain.

Excellent geometry and balanced ride

Composed, capable, and predictable suspension

Climbs well for such a downhill-focused bike

Excels in challenging terrain

Chassis may be too stiff for some

Chain drop issues due to improperly spaced lower idler (fixed)

Stock chainstay protector did very little to manage noise

The all-new Trek Slash is beefed up in celebration of its sixth iteration. This fresh design features an oversized, 19-tooth idler pulley and a high-pivot rear suspension configuration for the first time in the model’s lineage. Travel has been increased to 170 millimeters, pushing it further into the all-out, winch-and-plummet ethos that so many enduro bikes seem to be gravitating to. Our 9.9 version was spec’d with Bontrager’s RSL integrated handlebar and stem, a SRAM T-Type XO drivetrain, and the all-new RockShox Vivid Ultimate rear shock. The previous Slash was an impressive bike. It was impressively light for an enduro bike and was surprisingly efficient to pedal around all day. The new Slash Gen 6 leans more heavily toward the chairlift and shuttle culture side of the mountain bike world with some extra heft and additional pulleys in the drivetrain. However, with the oversized pulley and lighter casing tires, I found the Slash to climb the most efficiently of any high-pivot bike I’ve reviewed thus far. I attribute this mostly to the large, 19-tooth upper idler.

A first look at Trek's high pivot idler-equipped sled for 2024.

The Trek Slash 9 9 shines on the steeps and excels in the rough, making it an almost perfect rig for enduro racing. Read the full Trek Slash 9.9 XO1 Review here.

Steep terrain crusher

Rough terrain performance

Not the best climber

Ineffective drain tube

Apr 2022 · Alan Muldoon

The Trek Slash 9.8 XT is an enduro bike with progressive geometry and 29er wheels and 170/160mm of travel, and offers a performance that seriously impressive. Good enough to make it on our list of the best enduro mountain bikes? Absolutely. It’s good enough to score a  10 out of 10; a rare feat. Trek Slash 9.8 XT need to know: Mino Link geometry adjustment allows for a 27.5in Mullet setup KnockBlock 2.0 offers an increases the steering angle from 58º to 72º and can be removed if needed A bash guard on the MRP chain guide helps protects the 30t XT chainring RockShox Super Deluxe Ultimate shock sports ThruShaft technology to control the 160mm travel We took the Trek Slash 9.9 XO1 for a first ride when it launched last year, and while the 2022 bike looks remarkably similar, right down to the frame colour of the bike we featured last time, there are several differences. The main one being that the XT equipped bike is £1,500 cheaper and there are changes to the specification that reflect its lower price. You get a full Shimano XT drivetrain and 4-piston XT brakes, rather than SRAM XO1. You also get a RockShox Zeb Select+ fork rather than the Ultimate, while the Bontrager Line Carbon 30 wheels switch to the alloy version. Downgrades? Yes, but none that should detract from the underlying ride quality of the Slash. The most important thing is that the OCLV carbon frame remains unchanged, so you still benefit from all of the advances in the frame geometry and suspension that Trek introduced last year. Updates that saw the addition of downtube storage, the head tube angle getting slacker, the seat tube steeper and the reach longer. Trek also made the suspension more progressive, and increased rear travel by 10mm to 160mm. All positive changes then. Trek Slash 9.8 suspension Trek has always been a big proponent of proprietary suspension components. As such, the RockShox Super Deluxe Ultimate shock on the Slash 9.8 XT features Trek’s ThruShaft technology and it’s the exact same shock that comes on the flagship model. This design eliminates the need for a high pressure IFP (internal floating piston) and in simple terms, this allows for lower breakaway resistance and improved sensitivity. And because the damper shaft passes straight through the shock body, it needs an extender mount and a small hole in the frame to accept the ThruShaft at bottom out. Sounds complex? Well it is, but thankfully setting up the suspension on the Slash is as easy as 1, 2, 3. Sag gradients make it simple to dial in the correct air pressure, and in the open setting the shock has three low-compression settings for fine tuning the response to pedal inputs or the style of terrain you’re riding. Also if you ever want to fit an aftermarket shock, that’s still possible as the Slash uses a 230×62.5mm metric shock size, you’ll just need different lower mounting hardware. Setting up the suspension …Continue reading »

Fast, fun and efficient. Tight, reactive ride. Progressive geometry. Versatile, composed. A do-it-all bike

XL would benefit from a steeper seat angle

Last updated April 28

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Trek Slash 8

• AUS $ NZD $ USD $ CAD $ GBP £ EUR €

Colour / Pennyflake, Matte Hex Blue

Size / SM (High, Low), MD (High, Low), ML (High, Low), LG (High, Low), XL (High, Low)

Weight / 34 lb 2.7 oz (15,500 g)

At a glance

- ABP (Active Braking Pivot) rear suspension design

- Geometry adjustable via Mino Link flip chip in rear rocker link pivot

- Knock Block 2.0 steerer stop

- Internal frame storage via quick-access latch under bottle cage mounts

- Control Freak internal cable routing

- Includes Bontrager BITS Internal Frame Storage Bag

- Includes Bontrager TLR tubeless rim strips, valve stems, and sealant

- Weight given for size MD set up tubeless

Where To Buy

Specifications

• Frame Alpha Platinum Aluminum, magnesium rocker link; molded shuttle guard, down tube, and chainstay protection
• Fork RockShox ZEB Select, DebonAir spring, Charger 2.1 RC damper, 38mm stanchions, 44mm offset, Maxle Stealth thru-axle
• Shock RockShox Super Deluxe Select+ RT, 230mm x 62.5mm
• Hubs Bontrager alloy, sealed bearings, 110x15mm Boost front, 148x12mm Boost rear with Rapid Drive 108 freehub and XD driver
• Wheels Bontrager Line Comp 30, tubeless ready
• Wheel Size 29"
• Spokes Bontrager Line Comp wheelset
• Tires Bontrager XR5 Team Issue, aramid bead, 120 TPI, tubeless ready, 29"" x 2.5"
• Chain SRAM GX Eagle, 12-speed
• Crank SRAM X1 Eagle DUB, 170mm length
• Bottom Bracket SRAM DUB, 73mm English/BSA theaded
• Rear Derailleur SRAM GX Eagle, 12-speed
• Shifters SRAM GX Eagle, 12-speed
• Brakeset SRAM Code R, 4-piston, SRAM CenterLine 6-bolt round-edge rotors (200mm front, 180mm rear), SRAM Code R
• Handlebar Bontrager Line, alloy, 820mm width, 27.5mm rise, 35mm clamp diameter
• Saddle Bontrager Arvada, hollow CrMo rails, 138mm width
• Seatpost TranzX JD-YSP39 dropper, 34.9mm, Single bolt Drop: 100mm (SM) 150mm (MD/ML) 170mm (LG/XL)
• Stem Bontrager Elite, 35mm length, 0° rise, 35mm bar clamp
• Grips Bontrager XR Trail Pro, alloy lock-on
• Headset Trek Knock Block 2.0 Integrated, 72° radius rotation limiter (includes infinite radius chip), sealed cartridge bearings

Q: How much is a 2023 Trek Slash 8?

A 2023 Trek Slash 8 is typically priced around $4,300 USD when new. Be sure to shop around for the best price, and also look to the used market for a great deal.

Q: Where to buy a 2023 Trek Slash 8?

The 2023 Trek Slash 8 may be purchased directly from Trek .

Q: How much does a 2023 Trek Slash 8 weigh?

A 2023 Trek Slash 8 weights 34 lb 2.7 oz (15,500 g).

Q: What size wheels does the 2023 Trek Slash 8 have?

The 2023 Trek Slash 8 has 29" wheels.

Q: What size 2023 Trek Slash 8 should I get?

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Trek Slash 9.8 XT review

• Alan Muldoon
• April 22, 2022

Yes, the Trek Slash 9.8 XT is a great choice for enduro, but its capable, lively ride makes it a great do-it-all choice for the one bike quiver

Trek Slash test winner Credit: Roo Fowler

Product Overview

Overall rating:, trek slash 9.8.

• Fast, fun and efficient. Tight, reactive ride. Progressive geometry. Versatile, composed. A do-it-all bike
• XL would benefit from a steeper seat angle

Manufacturer:

Price as reviewed:.

The Trek Slash 9.8 XT is an enduro bike with progressive geometry and 29er wheels and 170/160mm of travel, and offers a performance that seriously impressive. Good enough to make it on our list of the best enduro mountain bikes ? Absolutely. It’s good enough to score a  10 out of 10; a rare feat.

Trek Slash 9.8 XT need to know:

• Mino Link geometry adjustment allows for a 27.5in Mullet setup
• KnockBlock 2.0 offers an increases the steering angle from 58º to 72º and can be removed if needed
• A bash guard on the MRP chain guide helps protects the 30t XT chainring
• RockShox Super Deluxe Ultimate shock sports ThruShaft technology to control the 160mm travel

mbr bike test editor putting the Trek Slash 9.8 through its paces

We took the Trek Slash 9.9 XO1 for a first ride when it launched last year, and while the 2022 bike looks remarkably similar, right down to the frame colour of the bike we featured last time, there are several differences. The main one being that the XT equipped bike is £1,500 cheaper and there are changes to the specification that reflect its lower price.

You get a full Shimano XT drivetrain and 4-piston XT brakes, rather than SRAM XO1. You also get a RockShox Zeb Select+ fork rather than the Ultimate, while the Bontrager Line Carbon 30 wheels switch to the alloy version. Downgrades? Yes, but none that should detract from the underlying ride quality of the Slash.

A full Shimano XT drivetrain including cranks

The most important thing is that the OCLV carbon frame remains unchanged, so you still benefit from all of the advances in the frame geometry and suspension that Trek introduced last year. Updates that saw the addition of downtube storage, the head tube angle getting slacker, the seat tube steeper and the reach longer. Trek also made the suspension more progressive, and increased rear travel by 10mm to 160mm. All positive changes then.

Trek Slash 9.8 suspension

Trek has always been a big proponent of proprietary suspension components. As such, the RockShox Super Deluxe Ultimate shock on the Slash 9.8 XT features Trek’s ThruShaft technology and it’s the exact same shock that comes on the flagship model. This design eliminates the need for a high pressure IFP (internal floating piston) and in simple terms, this allows for lower breakaway resistance and improved sensitivity. And because the damper shaft passes straight through the shock body, it needs an extender mount and a small hole in the frame to accept the ThruShaft at bottom out.

This might be a cheaper bike but the RockShox Super Deluxe Ultimate shock is the exact same shock that comes on the flagship model

Sounds complex? Well it is, but thankfully setting up the suspension on the Slash is as easy as 1, 2, 3. Sag gradients make it simple to dial in the correct air pressure, and in the open setting the shock has three low-compression settings for fine tuning the response to pedal inputs or the style of terrain you’re riding. Also if you ever want to fit an aftermarket shock, that’s still possible as the Slash uses a 230×62.5mm metric shock size, you’ll just need different lower mounting hardware.

Setting up the suspension on the Slash is as easy as 1, 2, 3

Up front the 170mm travel RockShox Zeb Select+ lacks the high speed compression adjuster found on the Ultimate, but you still have the low-speed compression and rebound to fine tune the ride. The burly 38mm chassis definitely adds stiffness and a real sense of security, something that heavier or harder charging riders will really appreciate.

Trek Slash 9.8 components

Sometimes it’s the little things that make a big difference. Like Trek swapping one of the 10mm headset spacers for two 5mm spacers so you can fine tune the height of the handlebar. It also fitted 170mm crankarms to improve pedal clearance, not that the Slash needs them as we had no issues with pedal strikes with the 175mm cranks on last year’s bike.

The Mino link

So if the low geometry setting is really the default mode, what’s the high setting on the Mino Link for? It should provide just enough clearance to run a 27.5in rear wheel if needed, especially with the 170mm cranks.

Rapid Drive 108 freehub on the Bontrager Line 30 wheelset

And while we’re on the subject of wheels, the Rapid Drive 108 freehub on the Bontrager Line 30 wheelset offers a 3.33º engagement angle, which is almost 7 times faster than the rear hub on the Specialized Stumpy Evo.

The removable Switch lever on the rear axle

Trek has missed a trick with it’s removable 6mm Switch lever on the rear axle though. Yes, it also fits the fork axle but if Trek used a stepped design like Scott has, it could probably add a 5mm allen key and a T25 to the same tool. Why is this important? Well, Trek has the smallest cutaway in the downtube for storage so you can’t pack as much stuff into the frame.

Trek Slash 9.8 performance

The Trek Slash is a deceptive bike. And if it weren’t for the burly RockShox Zeb fork, you’d never guess by looking at the compact carbon frame that it’s a big travel rig designed to tackle the toughest enduro race stages. However, the numbers don’t lie. With the size L Slash sporting a 63.5º head angle and a 1,272mm wheelbase, it has a footprint that guarantees a stable grounding even on unstable terrain.

Don’t let the number fool you, this bike is incredibly capable

And while the 29in wheels can certainly truck over rough terrain with the best of them, make no mistake, the Slash is no monster truck. If anything, it’s tight, reactive ride belies its generous travel. And nowhere is that more apparent than when you stomp on the pedals. This bike simply motors.

It feels more solid than the Stumpy or Jam too, something that will definitely favour heavier riders. At a hair over 15kg with our Maxxis control tyres fitted, you don’t even pay a weight penalty for the extra travel or solidity.

The balanced geometry and low standover allows you to get into all sorts of shapes on the Slash, which makes it easy to stay on top of the bike. Basically you always feel like you’re piloting the Slash, never a passenger. Yes, the downtube storage isn’t as generous as on the Stumpy, but with an extra tool pouch you could easily crame more stuff into the undercarriage.

Downtube storage includes two small bags for organising and stowing essentials

Our only real criticism of the Slash then, is that there’s quite a bit of chain noise. So if you have the legs to push a 32t chainring this would provide some extra clearance between the upper run of the chain and the chainstay. Failing that, you could stick with the stock 30t chainring as add additional rubber protection to key areas of the stays.

• Best enduro mountain bikes ridden and rated
• Best mountain bike: The ultimate trail, XC and enduro bikes tried and tested

For an enduro bike with progressive geometry, the Trek Slash 9.8 XT is incredibly versatile. Get on the gas and it responds with a sense of urgency that’s usually reserved for shorter travel bikes. Land deep of a drop, or jump, however, and the rear suspension graces you with a featherlight landing. Cool and composed in every situation the Trek Slash is not the outright plushed bike we’ve ever tested, but the suspension response is always proportional and measured, so you never feel under or over-biked. It’s what makes the Slash the ideal choice for anyone looking for that one do-it-all ride.

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Trek Slash 8 review

Trek's Slash 8 wins our coveted 2021 Enduro Bike of the Year award

Andy Lloyd / Immediate Media

Robin Weaver

Easy to ride, very natural feeling geometry; great kit for the cash; easy to throw about yet still calm and stable when it needs to be; seriously impressive suspension

Tyres aren’t the best in damp mud

The Trek Slash 8 is our Enduro Bike of the Year for 2021 . After pitting it against seven of the best out there, all at a similar price, it was the Slash 8 that impressed us most in the end.

Meeting the criteria to win this category is no easy feat and the bikes at the pointy end of this test ticked just about every box going.

For a start, while an enduro bike might be designed to go downhill fast, it still needs to get to the top of the hill as efficiently as possible. It’s then got to handle all manner of trails thrown at it with composure and control, but still remain fun and playful throughout.

It took some serious time and effort back-to-back testing all eight of these bikes, which ranged in price from £3,450 to £4,198, riding them on a wide variety of trails and pummelling them relentlessly over rock and root until we found a winner.

Once the dust had settled, it was the Trek Slash 8 that had managed to edge its way into the lead. Its ability to tackle the wildest terrain without flinching yet all the while retaining that reactive, lively feel really won us over.

The Trek Slash has seen more than its fair share of glory over the years and was one of the first long travel 29ers to be properly proven on the world stage. Much of that success was thanks to the highly decorated Tracy Moseley, who always championed the big wheels and rode them to victory year after year.

More recently, the Slash has been making headlines with the likes of Katy Winton, Pedro Burns and Florian Nicolai piloting it.

Last year, the Slash received its first update in some time, all in a bid to properly freshen things up and bring some of that winning magic back into the mix.

The changes the US brand made to the 2021 Slash are substantial and are detailed here , but just how do they translate to the trail?

Trek Slash 8 frame and suspension details

Travel has been upped to 160mm at the rear and is now paired with a longer travel 170mm travel fork up front. It continues to be delivered via Trek’s Active Braking Pivot (ABP) suspension system which places the chainstay pivot concentric to the rear axle.

This design, in Trek’s words, enables it to “tune how the suspension reacts to acceleration and braking forces independently”. And while this might look unchanged, Trek has moved the main pivot up slightly in a bid to increase anti-squat and make the Slash pedal more efficiently.

Controlling that 160mm of travel is the proprietary RockShox Super Deluxe Thru Shaft shock. This design features a shock shaft that goes through the damper body and exits out of the bottom of the shock when compressed.

This means that the shaft doesn’t displace any extra oil as it enters the damper and therefore does away with the need for a dynamic IFP (internal floating piston – which is what compensates for oil displaced by the shock shaft) – something that Trek attributes additional complexity and lag as the shock transitions between the compression and rebound phase, thanks to the reduction in friction.

The theory, at least, should make the back end of the Slash feel seamlessly smooth and incredibly active. It’s also worth noting that the Slash will work with a standard shock as well.

Where the Slash differs from almost all other aluminium frames (and the majority of carbon ones, too), is its internal frame storage. Slide the lever below the bottle cage downward, lift the cage and hatch door up and off the down tube and you’ll find a handy opening, much like the S.W.A.T storage found on some Specialized carbon frames.

You’ll be able to squirrel away a tube and tools in here, rather than carry them on your person. Trek includes a tool roll to help prevent things rattling once stashed inside, too.

While the down tube shape has changed slightly with the latest iteration of the Slash and now offers enough room for the fork crown to clear it, thanks to the subtle curve just behind the head tube junction, Trek has stuck with its steering limiting Knock Block system.

Knock Block stops the bar from turning past a certain angle, preventing the controls on the bar from potentially impacting the top tube and breaking, or, as with the old Slash, the fork crown hitting the down tube.

The latest Knock Block 2.0 used here offers a much greater steering angle before it stops the bar from turning (72 degrees rather than 58 degrees), but if that’s still not enough for you, it can be removed.

Finally, Trek has moved to a wider diameter seatpost, opting to go with the less-common 34.9mm rather than the more popular 30.9mm or 31.6mm alternatives.

While you’ll find fewer aftermarket alternatives should you wish to upgrade your dropper post, it’s worth noting the benefits that this broader diameter brings. The main one is more space internally for the dropper post mechanism, which should make the post more reliable and stiffer.

Trek Slash 8 geometry

The Slash has been, like most other enduro-style bikes in need of a makeover, stretched out, slackened and steepened in all the relevant areas. My medium frame offers a very reasonable 450mm reach, which is a massive jump of 25mm in the low setting over the 2020 model.

Trek has relaxed the head angle for improved high-speed stability and paired it with a 42mm offset fork in a bid to create the ultimate composure through rough turns. I measured the head angle at 64.1 degrees, which is now pretty much standard for bikes like this.

The seat angle has been steepened by a staggering 2 degrees in a bid to improve climbing efficiency, putting the rider’s hips more directly over the bottom bracket.

With my saddle set at just under 700mm (measured from the centre of the bottom bracket to the top of the saddle), the effective seat tube angle of the Slash 8 measured just over 76 degrees in the low setting.

The two geometry settings (low and high) are accessed via the Mino Link ovalised chips that sit inside the EVO rocker link on the seatstay pivot. Switching between the two settings alters the head and seat angles by 0.5 degrees and the bottom bracket height by a substantial 8mm.

In the low setting, I measured the bottom bracket at 344mm off the floor with a drop of 29mm, which certainly isn’t bad for a bike with this much travel.

Effective chainstay length has increased by just 2mm (now up to 437mm) compared with the 2020 model, and this remains constant across all frame sizes.

Trek Slash 8 geometry (low setting)

Trek slash 8 specifications.

The Slash 8 is a serious looker with some great kit bolted to it. Ask anyone at the trail head how much they think it’s worth and chances are they’ll give you a price far higher than its true value.

Let’s start with the suspension. The proprietary RockShox Super Deluxe Ultimate Thru Shaft rear shock – which, by the way, is impressive to see on a bike at this price – is paired with a Lyrik Select fork that pumps out 170mm of travel.

While this might not be the top-tier, all singing, all dancing Lyrik, it still gets the Charger 2.1 RC damper, which allows you to finely tune both the low-speed compression and rebound damping.

A SRAM GX Eagle drivetrain offers a decently wide spread of gears, thanks to that 10-52t cassette.

Again, it’s impressive to see a drivetrain like this on a bike at this price. That said, Trek has saved a little cash by opting to use the cheaper X1 cranks with a stamped steel chainring, rather than the sleeker finished GX equivalents.

Stopping duties are taken care of by a powerful set of SRAM Code R brakes that clamp around 200mm (front)/180mm (rear) rotors. At the lever, there’s tool-free reach adjust which is handy for dialling in lever set up.

The rest of the kit on the Slash 8 comes courtesy of Trek’s in-house components brand Bontrager: bar, stem, grips, dropper post and the rather firm Arvada saddle.

Bontrager also takes care of the wheels, Line Comp 30s, as well as the tyres, speccing XR5 Team Issues upfront and the lower profile and narrower XR4 Team issue at the rear.

All in, my medium Slash 8 weighed 15.25kg.

Trek Slash 8 ride impressions

Set up on the Slash was relatively straight forward; I set the sag at the rear to 30 per cent and didn’t add any more pressure to the shock during testing.

I did find I needed to toggle the low-speed compression dial into the ‘ ’ setting on the shock to get the support I was after through high-load turns and up take-offs.

Setting the rebound took a bit of playing around with, too, but in the end, I settled on four clicks from fully closed, which left it feeling fast and active but still controlled when returning from deep in the travel.

I stuck with the single volume spacer in the Lyrik fork and added 14 clicks of low-speed compression from fully closed with 70psi in the spring. This coupled with 12 clicks of rebound damping left the fork feeling active and supple yet still composed enough when the hits came thick and fast.

I tested the Slash 8 on a mix of steep, natural trails littered with roots and rocks, but all of them were generally quite slow due to their technical nature. So I spent a decent chunk of time getting some high-speed bikepark laps under my belt, subjecting the Slash 8 to fast, flowy trails, high-load turns, jumps and long stretches of jagged rocks, just to see how well it held up when the pace really picked up.

Big thanks to Bikepark Wales for letting us come and use the facilities to test despite being closed.

Trek Slash 8 climbing performance

The Slash felt incredibly easy-going when pointed uphill, especially considering the travel on tap and its outright intentions. This is mainly due to the easy-rolling tyres and just how stable the back end of the bike is when seated and spinning a gear.

At no point did I reach down for the shock's lever to firm things up because I never felt the need to. Instead, the Slash managed to sit relatively high in its travel and remain stable, with little in the way of suspension bob while the power was being applied.

Because the shock wasn’t sinking too deeply into its travel, the Slash managed to maintain its reasonably steep seat angle, which puts you in a nicely efficient, but most importantly, comfortable position for climbing. Even on steeper pitches where I was really mashing the pedals, I never once felt the need to firm the shock up.

While the 610mm effective top tube isn’t massive, it is longer (not by much) than a number of its contemporaries. While I wasn’t overly bothered by this on shorter climbs, I really started to appreciate the space this created when seated on much longer climbs up the hill.

I also appreciated the big 52t cog on the SRAM GX Eagle cassette which, after spending a long day riding lap after lap, I spent more than my fair share of time using to help preserve energy when I was really feeling fatigued but couldn’t face getting off and walking.

Trek Slash 8 descending performance

Thanks to the frame's well-considered proportions, the Slash offers up a well-centred, confident ride position, and it doesn’t take long to adapt to.

When pointed down steeper, more natural trails, I was instantly impressed by how well balanced the bike felt front to rear and how active the back end of the bike remained while it worked tirelessly trying to eke out every ounce of traction available.

And this was despite the lack of bite from the XR4 rear tyre, which doesn’t offer quite the same in terms of corner traction or braking grip compared to the likes of a Maxxis DHR II, for example.

The front tyre was a little better, but when properly leaned over in a soft, muddy turn, the shoulder tread doesn’t dig in quite as well as others, which can make for some dicey moments when the tyres do break traction.

Thankfully things remain quite predictable, so you know when you’ve reached their limit. Still, there’s no knocking their rapid rolling speed on smoother, harder packed terrain.

It was when riding a dedicated jump trail that I started playing around with the low-speed compression settings on the shock. In the default ‘zero’ setting, I was finding that I wasn’t getting as much support in the mid-stroke as I’d have liked when loading the bike from turn to turn or pumping up take-offs.

Switching the low-speed dial to the ‘ ’ position helped to cure this and while Trek says this setting is designed for this exact type of riding, I never found any drawbacks when riding other types of terrain while in it.

Throw the Slash 8 back into the technical stuff and its confident manner really starts to come to the fore as speeds pick up. Stove it head-on into a boulder field and the way this bike deals with the chaos is seriously impressive.

The Slash’s super-supple suspension recovers so rapidly hit after hit, it manages to track the trail with pin-point accuracy and without sinking too low into its travel or sacrificing any of that much-loved liveliness or pop.

The support through the suspension coupled with the taut feel through the frame ensures that you can really feel a difference in speed as you pump every bump or undulation.

That reactiveness also means that getting back up to speed after tackling a slower section or awkward obstacle doesn’t feel anywhere near as laboured as it can on some super-plush big travel rigs.

Slam on the impressively punchy Code R brakes, spot your line and commit, and the Slash will soak up whatever mess lies beneath the tyres and fire you out the other side faster than you thought possible.

It’s easy to hold onto that speed too, even when things get really ugly. Here, the calm exuded by the Slash is simply incredible. While the wheels frantically bash through bump after bump beneath you, it feels as if the chassis barely flinches, isolating the rider from the worst of the feedback and remaining steadfast with no awkward pitching back or forth.

It’s this illusion of tranquillity that the Slash manages to conjure up to give you what feels like extra time to make these split-second decisions.

The Slash’s ability to hoover up the chunder with relative ease makes riding faster a whole lot easier. And that’s the whole point of these bikes, right?

Trek Slash 8 bottom line

It took some back-to-back testing to really highlight just how impressive the Slash can be when tackling the rowdiest of terrain, but thanks to its impressive climbing manners, tidy frame details, good geometry and superb suspension, the new Trek Slash 8 has truly won me over.

While others like the Whyte G-180 might feel closer to a downhill bike in many ways, the Trek’s composure in the rough coupled with the fact that it still feels that bit more agile, poppy and playful is what helps to make this bike truly shine.

Yes, some better tyres would really help improve its performance when it comes to tackling steep, natural, muddy trails (and after switching tyres I can confirm this is the case) but factoring in the extra rubber cost at the point of purchase certainly isn’t a dealbreaker.

Overall, the Slash 8 impressed time and time again on a multitude of terrain and I was constantly in awe of the speed this thing carries through the nastiest of terrain.

A massive thank-you to BikePark Wales for granting us access to its trails despite the bike park being closed to the public.

Cheers also to Fox clothing for sorting the kit for the photo and video shoots and Garmin for sorting us out with bike computers to log the many miles of testing.

And not forgetting Muc-Off , for its help keeping the bikes washed and lubed throughout testing.

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Trek Slash 8 Gen 6 Review

• strorage compartment
• one of the best bikes in this price range
• rides excellent in the downhill
• great groupset for this price range
• 25 years warranty
• with 16,5 kg unfortunately a bit heavy

OVERALL BIKE CHECK

The most importanten ratings of the Slash 8 Gen 6 ⬤ in comparison to the competitor bikes of following categorie: (Enduro up to 4500 €) ⬤ .

VALUE for MONEY CHECK

If you are keen on value for money, this is your chart. It shows you at a glance how many bike you get for 4499 €.

Expirience with the Trek Slash 8 Gen 6

best alternatives

Je steiler der Winkel des Sitzrohrs ist, desto effizienter können Sie in die Pedale treten.

• Frame Slash Alu
• Frame Material Aluminium
• Fork FOX Rhythm 36, Float EVOL-Luftfeder, GRIP-Dämpfer, konischer Gabelschaft, 44 mm Versatz, Boost110, 15 mm Kabolt-X-Achse, 170 mm Federweg
• Spring Unit air
• Remote-Lockout yes
• Damper FOX Performance Float X, 2-Positionen-Dämpfung, 230 x 65 mm
• Gearrange 510%
• Drivetrain 1x12
• Gear Lever Shimano XT M8100, 12fach
• Rear Derailleur Shimano XT M8100, langer Käfig
• Crank Shimano Deore M6120, 30 Z., 55 mm Kettenlinie, 165 mm Kurbelarmlänge
• Cassette Shimano XT M8100, 10-51 Z., 12fach
• Chain Shimano SLX M7100, 12fach
• Brake Set Hydraulische 4-Kolben-Scheibenbremse von Shimano, M6100 Bremshebel, M6120 Bremssattel
• Brake Rotors 203/203
• Rims Bontrager Line Comp 30, Tubeless Ready, 6-Loch-Scheibenaufnahme, Boost110, 15 mm-Steckachse
• Front Hub Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-Loch-Scheibenaufnahme, Boost148, 12 mm Steckachse
• Tires Front Bontrager XR5 Team Issue, Tubeless Ready, Inner Strength Karkasse, Aramidwulstkern, 60 TPI, 27.5 x 2.50
• Tires Rear Bontrager SE6 Team Issue, Tubeless Ready, Core Strength-Flankenschutz, Aramidwulstkern, 120 TPI, 29 x 2.50
• Saddle Bontrager Arvada, Streben aus CrMo-Rohr, 138 mm Breite
• Seat Post Größe: S Bontrager Line Dropper, 100 mm Hub, MaxFlow, interne Zugführung, 34,9 mm, 310 mm Länge Größe: M, M/L, L, XL Bontrager Line Dropper, 170 mm Hub, MaxFlow, interne Zugführung, 34,9 mm, 450 mm Länge
• Stem Bontrager Elite, 35 mm, 0 Grad, 35 mm Länge
• Handle Bar Bontrager Line, Aluminium, 35 mm, 27,5 mm Rise, 820 mm Breite
• Handle Bar Width 820

Trek Procaliber 9.8 in review

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• Slash 9.8 XT Gen 5

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Winner - Mountain Bike category

"The combination of high-end performance with individuality and user-friendliness in the thought-through package delighted the entire jury."

"Feels exactly right"

"The Slash has a big-bike feel that makes it easier to charge into an unfamiliar trail, while retaining enough maneuverability to prevent it from feeling like overkill on mellower trails."

Enduro Bike of the Year

Once the dust had settled, it was the Slash that managed to edge its way into the lead. Its ability to tackle the wildest terrain without flinching yet all the while retaining that reactive, lively feel really won us over.

"A hell of a bike"

"Slash is great on rough, bermed corners and it has been an absolute monster riding steeps. This is an easy bike to ride and everything felt very natural from the first drop in and I haven't looked back since."

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