Procaliber 8 | Trek Bikes
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SALE 2018

Procaliber 8

$1,799.99 $2,199.99 Model 21841

Procaliber 8 delivers all the trims of a race-ready XC mountain bike—RockShox fork, Shimano XT/SLX drivetrain—on a lightweight, durable Alpha Platinum Aluminum frame with an IsoSpeed decoupler that smoothes out rough trail. This is a high-quality hardtail with the key performance upgrades chosen to help you toward your fastest, longest rides ever.

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It's right for you if...

You like the responsiveness of an aluminum frame, and would rather spend your money on better components than a full carbon frame. You want a ride that's lightweight and responsive, with an IsoSpeed decoupler and carbon seatpost so you can pedal over rough spots with comfort and ease. 

The tech you get

A durable and light Alpha Platinum Aluminum frame with IsoSpeed, Shimano Deore XT/SLX 2x11 drivetrain, Race Face Next R carbon crank, Shimano M500 hydraulic disc brakes, and an advanced RockShox Reba RL fork with Motion Control damper and a remote lockout. Plus, Boost 148/110 Duster Elite wheels and additional lightweight parts, like a Bontrager Pro OCLV Carbon seatpost and Montrose Comp saddle.

The final word

This is hands down the best aluminum hardtail we make. You're getting Trek's highest-grade Alpha Platinum Aluminum frame, the unique advantage of trail-smoothing IsoSpeed, a full-on race-worthy spec, a carbon crank, and the kind of quality suspension that can hold its own on the World Cup XC circuit.

favorite_borderWhy you'll love it

  1. The IsoSpeed decoupler makes it ride smoother than any other hardtail, so your body doesn't get beat up by trail chatter
  2. You're putting your money into the parts that make a big difference in performance: an advanced frame, carbon crank, and quality RockShox suspension
  3. The carbon crank saves a lot of weight, and it's super responsive when you're putting the hammer down on a climb
  4. Ride the fastest wheel that fits with Smart Wheel Size

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  • Frameset

    Alpha Platinum Aluminum, IsoSpeed, E2 tapered head tube, internal derailleur routing, balanced post mount brake, PF92, Boost148, G2 Geometry on 29ers
    Front suspension
    RockShox Reba RL, Solo Air spring, Motion Control remote lockout, E2 tapered steerer, G2 Geometry w/51mm offset on 29ers, Boost110, 100mm travel (13.5: 80mm travel)
  • Wheels

    Bontrager Duster Elite 23, Tubeless Ready, Boost110 front, Boost148 rear, tubeless strips included, valves sold separately
    Bontrager XR2 Team Issue, Tubeless Ready, 120 tpi, aramid bead, 29x2.20˝ (13.5 & 15.5: 27.5x2.20˝)
  • Drivetrain

    Shimano SLX M7000, 11 speed
    Front derailleur
    Shimano SLX M7020
    Rear derailleur
    Shimano Deore XT M8000, Shadow Plus
    Race Face Next R, 36/26
    Bottom bracket
    Shimano SLX M7000, 11-42, 11 speed
    KMC X11-1
    Not included
  • Components

    Bontrager Montrose Comp, chromoly rails
    Bontrager Pro, OCLV Carbon, 31.6mm, 5mm offset
    Bontrager Race Lite, 31.8mm, 5mm rise, 720mm width
    Bontrager Race Lite, lock-on
    Bontrager Elite, 31.8mm, 7 degree
    FSA IS-2, 1-1/8˝ top, 1.5˝ bottom
    Shimano MT500 hydraulic disc
  • Weight

    17.5" - 11.79 kg / 26.00 lbs (with 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 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 Frame rise
17.5 in 41.9 72.5° 72.5° 9.0 69.5° 59.9 31.1 5.8 43.5 5.1 8.3 109.8 74.6 41.2 59.5 59.5

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