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Procaliber 6


Procaliber 6 is a fast cross country mountain bike and the most affordable MTB model with IsoSpeed—a decoupler at the top tube/seat tube junction that provides additional compliance on rough courses. IsoSpeed gives you a unique and substantial advantage over a traditional hardtail, because it cuts down on the trail's fatiguing bumps and delivers a smoother, faster ride.



Product Detail

The IsoSpeed advantage

Smooth means fast. 
Our innovative IsoSpeed decoupler 
increases vertical compliance 
and smooths trail chatter 
without sacrificing pedaling efficiency 
so you can ride faster, longer, 
and stronger.


Light, lighter, or lightest

Choose our best alloy option 
with Alpha Platinum Aluminum, 
or opt for a smoother, 
lighter ride with OCLV Mountain Carbon. 
Still not light enough? 
Procaliber SL models save an additional 
200 grams and feature 
Trek's Control Freak cable routing.

Smart Wheel Size

Smart Wheel Size ensures you’re on 
the fastest wheel that fits. 
Sizes 17.5˝ and larger get 29-inch wheels, 
while the smaller sizes 
get more proportional 27.5-inch wheels 
for a proper XC fit 
and optimum power and speed.

It's right for you if...
You like to go fast, 
and also love the idea of a hardtail 
with frame tech designed to take 
the edge off rough singletrack. 
Speed is your main consideration, 
but comfort is right up there, too.

The tech you get
A durable and light 
Alpha Platinum Aluminum frame with IsoSpeed, 
a SRAM NX Eagle 1x12 drivetrain, 
and Shimano hydraulic disc brakes. 
Plus, Bontrager Kovee 
28-hole Tubeless Ready wheels 
and an adjustable RockShox Judy Gold RL 
air fork with remote lockout 
that lets you lock out the fork 
without taking your hands off the bars.

The final word
A lightweight cross-country ride 
with advanced IsoSpeed tech 
that just isn't available anywhere else. 
With a 1x12 drivetrain, 
the trail-smoothing IsoSpeed decoupler, 
and precise hydraulic disc brakes, 
Procaliber 6 gives you a fast, 
efficient ride that can't be matched 
for this price.



  • Frameset

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

    Front hub
    Bontrager sealed bearing, alloy axle, centerlock, Boost110
    Rear hub
    Bontrager sealed bearing, centerlock, Boost148
    Bontrager Kovee 28-hole Tubeless Ready
    Bontrager XR2 Team Issue, Tubeless Ready, 120 tpi, aramid bead, 29x2.20˝ (13.5 & 15.5: 27.5x2.20˝)
  • Drivetrain

    SRAM NX Eagle, 12 speed
    Rear derailleur
    SRAM NX Eagle, Type 3 Roller Bearing Clutch
    SRAM NX Eagle Dub, 30T Direct Mount
    Bottom bracket
    DUB PF92
    SRAM XG-1230 Eagle, 11-50, 12 speed
    SRAM NX Eagle
    Not included
  • Components

    Bontrager Arvada, hollow chromoly rails
    Bontrager alloy, 2-bolt head, 31.6mm, 8mm offset
    Bontrager Comp alloy, 31.8mm, 5mm rise, 720mm width (13.5: 690mm width)
    Bontrager XR Trail Comp, nylon lock-on
    Bontrager Elite, 31.8mm, 7 degree, Blendr compatible
    FSA IS-2, 1-1/8˝ top, 1.5˝ bottom
    Shimano MT400 hydraulic disc
  • Weight

    17.5˝ - 12.20 kg / 26.9 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.


All measurements provided in cm unless otherwise noted.

Frame size number Wheel size A — Seat tube B — 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
13.5 in 27.5" 34.3 73.0° 10.0 69.0° 54.1 30.2 4.8 42.5 4.4 8.7 103.7 73.5 37.0 56.3
15.5 in 27.5" 36.8 73.0° 10.0 69.3° 55.8 30.2 4.8 42.5 4.4 8.5 105.3 75.3 38.2 56.3
17.5 in 29" 41.9 72.5° 9.0 69.5° 59.9 31.1 5.8 43.5 5.1 8.3 109.8 75.0 41.2 59.5
18.5 in 29" 44.4 72.3° 9.0 69.5° 61.7 31.1 5.8 43.5 5.1 8.3 111.3 76.4 42.7 59.5
19.5 in 29" 47.0 72.0° 10.0 69.5° 63.8 31.1 5.8 43.5 5.1 8.3 113.2 77.8 44.2 60.4
21.5 in 29" 52.1 72.0° 12.0 69.5° 65.9 31.1 5.8 43.5 5.1 8.3 115.4 81.6 45.7 62.8
23 in 29" 55.9 72.0° 12.0 69.6° 67.3 31.1 5.8 43.5 5.1 8.3 116.6 84.7 47.1 63..2
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