X-Caliber 8 | Trek Bikes

2019

X-Caliber 8

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.

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.

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.

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.

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

From transporting on a rack to fixing a flat, sometimes those wheels need to come off your bike. Keep watching to learn how to safely remove and install wheels that use a quick release system.

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A clean bike is a happy bike, but washing your ride is a bit more complicated than a quick spray with the hose or a joyride through your local car wash. Follow our step-by-step process and you’ll learn the dos and don’ts of keeping your bike in tip-top shape!

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Setting your bike's tire pressure correctly will give you a more comfortable ride with better grip and handling. Even better, it can help prevent flats

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Flat? Fixed. Our simple how-to video will show you how to get back on two wheels in no time flat.

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2019

X-Caliber 9

$1,659.99

2019

X-Caliber 7

$1,019.99

2019

X-Caliber Frameset

$589.99

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

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

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.

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

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

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.

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.

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.

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˝ - 13.43 kg / 29.6 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.

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

13.5

147.0 - 155.0 cm

4'9.9" - 5'1.0"

69.0 - 73.0 cm

27.2" - 28.7"

15.5

153.0 - 162.0 cm

5'0.2" - 5'3.8"

72.0 - 76.0 cm

28.3" - 29.9"

17.5

161.0 - 172.0 cm

5'3.4" - 5'7.7"

76.0 - 81.0 cm

29.9" - 31.9"

18.5

170.0 - 179.0 cm

5'6.9" - 5'10.5"

80.0 - 84.0 cm

31.5" - 33.1"

19.5

177.0 - 188.0 cm

5'9.7" - 6'2.0"

83.0 - 88.0 cm

32.7" - 34.6"

21.5

186.0 - 196.0 cm

6'1.2" - 6'5.2"

87.0 - 92.0 cm

34.3" - 36.2"

195.0 - 203.0 cm

6'4.8" - 6'7.9"

92.0 - 95.0 cm

36.2" - 37.4"

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