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2018

X-Caliber 8

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$1,149.99 Model 21577
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 Duster Elite 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)

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Features

Specifications

  • Frameset

    Frame
    Alpha Gold Aluminum, E2 tapered head tube, internal derailleur & dropper post routing, rack & kickstand mount, Boost141, G2 Geometry
    Front suspension
    RockShox 30 Silver, air spring, preload, rebound, TurnKey lockout, E2 tapered steerer, G2 Geometry w/51mm offset on 29ers, 100mm travel (13.5: 80mm travel)
    Max compatible fork travel
    Test
  • Wheels

    Front hub
    Formula DC20 LW alloy
    Rear hub
    Formula DC2241 alloy, Boost141
    Rims
    Bontrager Duster Elite Tubeless Ready 28-hole, tubeless 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 M6020
    Rear derailleur
    Shimano Deore XT, Shadow
    Crank
    Race Face Ride, 36/22
    Bottom bracket
    Sealed cartridge
    Cassette
    Shimano HG50, 11-36, 10 speed
    Chain
    KMC X10
    Pedals
    Wellgo nylon platform
  • Components

    Saddle
    Bontrager Evoke 1.5
    Seatpost
    Bontrager SSR, 2-bolt head, 31.6mm, 12mm offset
    Handlebar
    Bontrager alloy, 31.8mm, 5mm rise, 720mm width
    Grips
    Bontrager Race Lite, lock-on
    Stem
    Bontrager Elite, 31.8mm, 7 degree
    Headset
    Semi-integrated, 1-1/8˝ top, 1.5˝ bottom
    Brakeset
    Shimano M315 hydraulic disc
  • Weight

    Weight
    17.5" - 13.06 kg / 28.80 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
15.5 in 36.8 73.5° 71.7° 9.0 69.3° 55.5 30.2 5.8 42.5 4.4 8.5 105.3 72.8 38.5 57.4 57.4
17.5 in 41.9 73.5° 72.0° 9.0 69.5° 59.5 31.1 5.8 43.8 5.1 8.3 110.6 74.3 41.8 59.8 59.8
18.5 in 44.4 73.5° 72.0° 9.0 69.5° 61.1 31.1 5.8 43.8 5.1 8.3 112.1 73.7 43.4 59.8 59.8
19.5 in 47.0 73.5° 72.0° 10.0 69.5° 63.1 31.1 5.8 43.8 5.1 8.3 114.2 75.3 45.1 60.8 60.8
21.5 in 52.1 73.5° 72.0° 12.0 69.5° 65.1 31.1 5.8 43.8 5.1 8.3 116.4 75.1 46.6 62.6 62.6
23 in 55.9 73.5° 72.0° 12.0 69.5° 66.6 31.1 5.8 43.8 5.1 8.3 117.8 77.3 48 62.6 62.6

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