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  • X-Caliber 8
NEW 2019

X-Caliber 8

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$1,149.99 Model 23156
X-Caliber 8 is a cross country mountain bike made for fast laps and long days on the trail. It's built with special attention to value and the parts that make the biggest difference in performance. A Shimano drivetrain, RockShox fork, and hydraulic disc brakes make it a great choice for new mountain bikers and XC racers searching for fast, fun, singletrack adventure.
X-Caliber 8 is a cross country mountain bike made for fast laps and long days on the trail. It's built with special attention to value and the parts that make the biggest difference in performance. A Shimano drivetrain, RockShox fork, and hydraulic disc brakes make it a great choice for new mountain bikers and XC racers searching for fast, fun, singletrack adventure.
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It's right for you if...

You're looking for a fast mountain bike for singletrack—one that's fully capable of taking on races, marathons, and competitive group rides. You want something that is reliable and fun with dependable, lightweight parts.

The tech you get

A lightweight Alpha Gold Aluminum frame, a RockShox 30 Silver suspension fork with a lockout and an air spring that's lighter and more adjustable than a coil spring, Bontrager Kovee Tubeless Ready wheels with Boost141 hub spacing, and a smooth, efficient Shimano Deore/XT 2x10 drivetrain with a Shimano XT Shadow rear derailleur, which stays tucked out of the way to avoid snagging on trail debris.

The final word

With X-Caliber 8, you're getting a performance frame paired with performance parts, like a RockShox air fork and a rear derailleur that's the gold standard for MTB performance and reliability. Plus, it's equipped with durable, lightweight alloy rims that save weight and are easy to upgrade to tubeless.

favorite_borderWhy you'll love it

  1. It has the price of a more basic hardtail and the performance of a more expensive one
  2. The RockShox air fork can be tuned to the rider's weight, so you always have a custom ride that's right for you
  3. The frame is fully compatible with higher-end parts, like race wheels and a dropper post, if you ever find the need to upgrade
  4. Smart Wheel Sizing means you'll get the fastest wheel that fits (29˝ wheels on larger frames, 27.5˝ wheels on smaller frames)

More options



Features

Suspension lockout

Locked suspension means your fork remains inactive, increasing pedaling efficiency. Perfect for extended road sections where efficiency is more important than bump absorption.

Smart Wheel Size

The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.

Internal derailleur routing

Sleek ports at the head tube and near the seat tube let you route your derailleur cables through the frame to keep your bike running smooth and clean.

Rack mounts

Going for a long ride? Rack mounts make carrying accessories a breeze.

Alpha Gold Aluminum

Our high-performance lightweight aluminum is continuously cold extruded and butted, and formed into manipulated tube shapes to balance strength and weight saving.

Extended size range

A wider range of sizes than the industry standard provides more option for everyone, from tallest to shortest and all those in between. Because everyone deserves a great ride.

Dropper post internal routing

Not ready for an internally routed dropper post now, but want to keep your options open? Select frames are equipped with the proper entry and exit points to accommodate internal routing for a Stealth seat post.

G2 Geometry

Advanced frame geometry and a custom offset fork give our 29ers precise handling at low speed without compromising high-speed stability. We call it G2 Geometry, and it's why our 29ers handle better than anyone's.

Specifications

  • Frameset

    Frame
    Alpha Gold Aluminum, tapered head tube, internal derailleur & dropper post routing, rack & kickstand mount, Boost141, G2 Geometry
    Front suspension
    RockShox 30 Silver, Solo Air, rebound adjust, TurnKey hydraulic lockout, tapered steerer, G2 Geometry w/51mm offset on 29ers, 100mm travel (13.5: 80mm travel)

  • Wheels

    Front hub
    Formula DC20 LW alloy
    Rear hub
    Formula DC2241, Boost141
    Rims
    Bontrager Kovee 28-hole Tubeless Ready, tubeless rim strips and valves sold separately
    Tires
    Bontrager XR2, 29x2.20˝ (13.5 & 15.5: 27.5x2.20˝)

  • Drivetrain

    Shifters
    Shimano Deore M6000, 10 speed
    Front derailleur
    Shimano Deore M617
    Rear derailleur
    Shimano Deore XT M781, Shadow
    Crank
    Race Face Ride, 36/22
    Bottom bracket
    Shimano BB52, 73mm
    Cassette
    Shimano HG50, 11-36, 10 speed
    Chain
    KMC X10
    Pedals
    VP-536 nylon platform

  • Components

    Saddle
    Bontrager Arvada
    Seatpost
    Bontrager alloy, 2-bolt head, 31.6mm, 12mm offset
    Handlebar
    Bontrager alloy, 31.8mm, 5mm rise, 720mm width (13.5: 690mm width)
    Grips
    Bontrager XR Trail Comp, nylon lock-on
    Stem
    Bontrager Elite, 31.8mm, 7 degree, Blendr compatible
    Headset
    Semi-integrated, cartridge, 1-1/8˝ top, 1.5˝ bottom
    Brakeset
    Shimano MT200 hydraulic disc

  • Weight

    Weight
    17.5˝ - 13.45 kg / 29.66 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 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
15.5 in 27.5" 36.8 71.7° 9.0 69.2° 56.4 30.6 4.8 42.5 4.4 8.7 105.4 72.8 38.4 57.5
17.5 in 29" 41.9 72.0° 9.0 69.3° 59.8 31.6 5.8 43.8 5.1 8.6 111.0 74.3 41.6 60.0
18.5 in 29" 44.4 72.0° 9.0 69.3° 61.4 31.6 5.8 43.8 5.1 8.6 112.6 73.7 43.2 60.0
19.5 in 29" 47.0 72.0° 10.0 69.3° 63.4 31.6 5.8 43.8 5.1 8.6 114.7 75.3 44.9 60.9
21.5 in 29" 52.1 72.0° 12.0 69.3° 65.5 31.6 5.8 43.8 5.1 8.6 116.9 75.1 46.4 62.8
23 in 29" 55.9 72.0° 12.0 69.3° 66.9 31.6 5.8 43.8 5.1 8.6 118.3 77.3 47.8 62.8

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