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It's right for you if...

You're building up a custom trail bike to for true trail riding. You're cool with trying new lines, getting a little wild, and leaving the ground. You're looking for a ride you can throw around and keep in control, even when the trail gets rowdy.

The tech you get

A durable and lightweight Alpha Platinum Aluminum frame with Control Freak internal cable routing, Mino Link adjustable geometry, Straight Shot down tube and Knock Block integrated frame protection, 150mm of rear travel with a RockShox Deluxe RT3 shock with Trek's exclusive RE:aktiv damper, Bontrager Line stem, and integrated Knock Block headset. Built for 27.5˝ wheels.

The final word

A trustworthy trail frame that's easy to handle in the rough, and fully capable of ripping down big all-mountain trails. A quality shock, 150mm of travel, and a host of exclusive frame tech give you a head start on your dream trail bike build.

The Walkthrough

favorite_borderWhy you'll love it

  1. Ultra-capable frame and shock for confidence on rough trails
  2. RE:aktiv keeps the shock firm for efficient pedaling and pumping, and instantly soaks up bumps to keep you in control
  3. Mino Link lets you make small adjustments to your geometry quickly and easily, even mid-ride
  4. Wider is more stable: Remedy has clearance for up to 27.5x2.8˝ tires

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Features

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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Straight Shot w/Knock Block

Trek's Straight Shot frame design optimizes the stiffness-to-weight ratio for a more responsive ride. You'll be able to push harder and stay more planted on your line when the going gets rough.

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RE:aktiv

RE:aktiv technology gives you firm support for efficient pedaling that instantly gives way for smooth control when the trail turns rough.

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Will my bike have a curved top tube?

Will my bike have a curved top tube?

Smaller frames (S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. Larger frames (M and up) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

Specifications

  • Frameset

    Frame
    Alpha Platinum Aluminum, ABP, Boost148, Knock Block, EVO link, tapered head tube, Mino Link, Control Freak internal routing, down tube guard, ISCG 05, 150mm travel
    Max compatible fork travel
    170mm
    Rear suspension
    RockShox Deluxe RT3, RE:aktiv 3-position damper, tuned by Trek Suspension Lab, 230x57.5 mm
  • Wheels

    Max tire size
    27.5x2.80"
  • Drivetrain

    Max chainring size
    36T
  • Components

    Stem
    Bontrager Rhythm Comp, Knock Block, 31.8mm clamp, 0 degree
    Headset
    Knock Block Integrated, sealed cartridge bearing, 1-1/8˝ top, 1.5˝ bottom
  • Weight

    Weight
    M - 3.30 kg / 7.28 lbs
    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

Inseam

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 in S High 27.5" 39.4 68.5° 74.7° 9.5 66.0° 56.0 35.6 0.9 43.3 4.6 11.1 113.9 75.0 40.1 58.3
15.5 in S Low 27.5" 39.4 67.9° 74.2° 9.5 65.5° 56.2 34.9 1.6 43.5 4.6 11.5 114.0 74.5 39.5 58.7
17.5 in M High 27.5" 41.9 68.5° 74.7° 10.0 66.0° 58.6 35.6 0.9 43.3 4.6 11.1 116.6 76.5 42.6 58.8
17.5 in M Low 27.5" 41.9 68.0° 74.2° 10.0 65.5° 58.8 34.9 1.6 43.5 4.6 11.5 116.7 76.0 42.0 59.2
18.5 in ML High 27.5" 44.5 68.5° 74.7° 10.5 66.0° 60.3 35.6 0.9 43.3 4.6 11.1 118.3 76.7 44.1 59.2
18.5 in ML Low 27.5" 44.5 68.0° 74.2° 10.5 65.5° 60.4 34.9 1.6 43.5 4.6 11.5 118.4 76.1 43.5 59.6
19.5 in L High 27.5" 47.0 68.5 74.7° 11.0 66.0° 62.4 35.6 0.9 43.3 4.6 11.1 120.5 76.2 46.1 59.7
19.5 in L Low 27.5" 47.0 68 74.2° 11.0 65.5° 62.5 34.9 1.6 43.5 4.6 11.5 120.6 75.7 45.5 60.1
21.5 in XL High 27.5" 52.1 68.5° 74.7° 12.5 66.0° 64.8 35.6 0.9 43.3 4.6 11.1 123.1 76.6 48.1 61.0
21.5 in XL Low 27.5" 52.1 68.0° 74.2° 12.5 65.5° 64.9 34.9 1.6 43.5 4.6 11.5 123.2 76.0 47.5 61.5

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