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It's right for you if...

You're looking to tackle huge days on huge mountains, whether it's an enduro race or an epic adventure. You want the light weight and muted vibes of a carbon frame, and you prioritize tunable suspension performance over a shiny top-shelf drivetrain.

The tech you get

A full OCLV Mountain Carbon frame with 160mm of travel and an all-new RockShox Super Deluxe Ultimate shock with an updated Thru Shaft damper, plus an all-new RockShox ZEB fork with extra-beefy 38mm stanchions. A SRAM GX Eagle drivetrain with the new 10-52 cassette and Line Carbon 30 wheels with a 54-tooth Rapid Drive hub for quick acceleration when you need it most.

The final word

This is a beast of a mountain bike. You get hot new suspension technology normally reserved for the most expensive bikes, and you get it on a fresh new frame. With Slash 9.8, the faster you go, the better it rides, so giddy-up.

The Walkthrough

favorite_borderWhy you'll love it

  1. The RockShox ZEB fork's bigger 38mm stanchions help you stay on your line through the chunky stuff, while the updated damper lets you dial in the feel
  2. New, removable Knock Block has a bigger steering angle to keep cables and hoses safe without sacrificing turning radius
  3. We added a second down tube guard to better protect your frame from shuttle-related damage
  4. Wider seat tube, wider dropper—the 34.9mm diameter post is stronger, more durable, and moves up and down faster
  5. A large internal storage compartment in the down tube lets you stow tools and gear

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RockShox Super Deluxe Thru Shaft damper

With the all-new RockShox Super Deluxe Ultimate Thru Shaft, you get the most refined shock on the market, with an updated air spring and an exclusive Thru Shaft damper that gives you tenacious grip, plush control, and the support you need for ripping rough descents all day.

Learn more

Active Braking Pivot

Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.

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Complete frame protection

Complete frame protection

Replaceable down tube guards protect the underside of your frame from rock strikes, trail debris, and janky shuttle vehicles so you can forget about damage worries and focus on blasting the next run.

OCLV Mountain Carbon

Trek's mountain-specific carbon fiber is tougher carbon, with unique materials and layup procedures, Trek's advanced engineering, and a higher standard of testing.

Learn more


*spec applies to all sizes unless otherwise noted

Frame OCLV Mountain Carbon main frame & stays, internal storage, tapered head tube, Knock Block 2.0, Control Freak internal routing, Carbon Armor, shuttle guard, threaded BB, ISCG 05, 34.9mm seat tube, magnesium rocker link, Mino Link, ABP, Boost148, 160mm travel
Fork RockShox ZEB Select+, DebonAir spring, Charger 2.1 RC damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 170mm travel
Shock NEW RockShox Super Deluxe Ultimate, DebonAir spring, Thru Shaft 3-position damper, 230x62.5mm
Wheel front NEW Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle
Wheel rear NEW Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost148, 12mm thru axle
Hub front Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle
Skewer rear Bontrager Switch thru axle
*Tire Size: S, M, M/L, L, XL
Bontrager SE4 Team Issue, Tubeless Ready, Core Strength sidewall, aramid bead, 60 tpi, 29x2.40''
Size: S, M, M/L, L, XL
Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewall, aramid bead, 60 tpi, 29x2.60''
Tire part Bontrager TLR valve, 50mm
Rim strip Bontrager TLR
Shifter SRAM GX Eagle, 12 speed
Rear derailleur SRAM GX Eagle
*Crank Size: S
SRAM GX Eagle, DUB, 30T, Boost (55mm chainline), 170 length
Size: M, M/L, L, XL
SRAM GX Eagle, DUB, 30T, Boost (55mm chainline), 175 length
Bottom bracket SRAM DUB, 73mm, BSA threaded
Cassette SRAM Eagle XG-1275, 10-52, 12 speed
Chain SRAM GX Eagle, 12 speed
Saddle Bontrager Arvada, austenite rails, 138mm width
*Seatpost Size: S
Bontrager Line Elite Dropper, 100mm travel, internal routing, 34.9mm, 345mm length
Size: M, M/L
Bontrager Line Elite Dropper, 150mm travel, internal routing, 34.9mm, 440mm length
Size: L
Bontrager Line Elite Dropper, 170mm travel, internal routing, 34.9mm, 485mm length
Size: XL
Bontrager Line Elite Dropper, 200mm travel, internal routing, 34.9mm, 550mm length
Handlebar Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 820mm width
Grips Bontrager XR Trail Pro, alloy lock-on
Stem Bontrager Line Pro, 35mm, Knock Block, Blendr compatible, 0 degree, 35mm length
Headset Knock Block 2.0 Integrated, 72-degree radius (includes infinite-radius chip), sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom
Brake SRAM Code R 4-piston hydraulic disc
*Brake rotor Size: S, M, M/L, L, XL
SRAM CenterLine, 6-bolt, round-edge, 180mm
Size: S, M, M/L, L, XL
SRAM CenterLine, 6-bolt, round-edge, 200mm
Weight M - 14.42 kg / 31.8 lbs (with TLR sealant, no tubes)
Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.


Rider Height


All measurements provided in cm unless otherwise noted.

Frame size number Frame size letter Geometry position Wheel size A — Seat tube B — Seat tube angle Effective seat tube angle C — Head tube length D — Head angle E — Effective top tube F — Bottom bracket height G — Bottom bracket drop H — Chainstay length I — Offset J — Trail K — Wheelbase L — Standover M — Frame reach N — Frame stack
15.5 S High 29" 39.5 67.1° 76.1° 10.0 64.6° 58.4 35.2 2.2 43.5 4.3 13.0 119.7 71.1 43.1 61.8
15.5 S Low 29" 39.5 66.6° 75.6° 10.0 64.1° 58.5 34.5 2.9 43.7 4.3 13.4 119.7 70.5 42.5 62.1
17.5 M High 29" 42.0 67.1° 76.1° 10.0 64.6° 60.9 35.2 2.2 43.5 4.3 13.0 121.2 74.9 45.6 61.8
17.5 M Low 29" 42.0 66.6° 75.6° 10.0 64.1° 61.0 34.5 2.9 43.7 4.3 13.4 122.2 74.3 45.0 62.2
18.5 ML High 29" 43.5 67.1° 76.1° 10.5 64.6° 62.8 35.2 2.2 43.5 4.3 13.0 124.2 74.9 47.4 62.2
18.5 ML Low 29" 43.5 66.6° 75.6° 10.5 64.1° 62.9 34.5 2.9 43.7 4.3 13.4 124.3 74.3 46.9 62.6
19.5 L High 29" 45.0 67.1° 76.1° 11.5 64.6° 64.7 35.2 2.2 43.5 4.3 13.0 126.3 75.9 49.1 63.1
19.5 L Low 29" 45.0 66.6° 75.6° 11.5 64.1° 64.9 34.5 2.9 43.7 4.3 13.4 126.4 75.3 48.6 63.5
21.5 XL High 29" 50.0 67.1° 76.1° 14.0 64.6° 68.3 35.2 2.2 43.5 4.3 13.0 130.4 77.9 52.1 65.4
21.5 XL Low 29" 50.0 66.6° 75.6° 14.0 64.1° 68.4 34.5 2.9 43.7 4.3 13.4 130.5 77.3 51.6 65.8

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