Trek X-Caliber 9

5.0 stars
 (3 Reviews)
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Full of fast, built to last

Caution: X-Caliber will get you hooked. It packs all of Trek’s XC race hardtail experience into a light, fast bike that pairs the right wheel size with each frame size.

Nothing beats the efficiency, simplicity, and straight-up fun of an X-Cal hardtail in 29er or 27.5". Great for XC racing, or simply shredding singletrack.

- All-new lightweight Alpha Gold Aluminum frame delivers a phenomenal ride quality
- Shorter chainstays and Boost141 hub spacing for increased agility and clearance for wider tires
- Updated geometry and E2 tapered head tube for more confident handling
- Sleek internal routing protects cables and accommodates dropper post upgrades
- 15.5-inch frame: 27.5-inch wheels
- 17.5—23-inch frames: 29-inch wheels

Features & Info

Geometry chart

Trek X-Caliber 9 geometry chart
Pedals sold separately

Consumer Reviews

5.0 stars

(3 reviews)

100% of respondents would recommend this to a friend.


  • Fun to ride 
  • Lightweight 
  • Well designed 
  • 2 X 10 
  • Solid performer 
  • Components 


Best Uses

  • Single Track  (2)
  • Backroads of Tennessee 
  • Urban Riding 
  • Cross Country 
  • Trails 

Jun 05, 2017

I bought a 2017 Trek X-Caliber 9 29 er, 19.5 inch frame..

Best Uses:
I love this 2017 Trek X-Caliber 9, 29er. My height is 5 11 1/2. I purchase my bike at NYC Bicycle Habitat. They are good professional people. I had ridden my bike one time so far in Central Park. I enjoyed my ride and had received a lot of good compliments on my new bike. I felt so good and probably did about 7 miles easily. My butt was soar and between my legs. I have to purchase some butt padds tights. I will wear them under my shorts.
by Polochuck from East Harlem

Apr 28, 2017

What a great bike!

Solid performer, Good components, Fun to ride, Well designed
Best Uses:
Single track, Backroads of Tennessee
I've ridden my Trek X-Caliber 9 (2016 model) for just over a year now and absolutely enjoy every minute that I'm on it! I spent a several months researching many different mountain bikes and talked with the guys at Bikers Choice in both Hendersonville, TN, and Mt. Juliet, TN, before making my decision. I have a road bike which I have ridden for nearly 15 years and have put many miles on, but this is my first mountain bike. I am 56 years old, and am 6'4" and my X-Caliber 9 is very comfortable to ride. David at Bikers Choice in Hendersonville was very helpful in the process of determining which bike and size would best suit my needs. I went with the 21.5 frame and I have the seat raised to the max recommended height. I ride primarily on the backroads of Middle Tennessee, but I have also had it on several single track trails and it has handled exceptionally well. I couldn't be more pleased with my choice. In fact, I haven't been back on my road bike since getting my X-Caliber!
by Tall Mike from Hartsville, TN

Jun 11, 2016

Trek X Caliber 9 Old guy in the saddle again

29er, Braking, Lightweight, Components, Front Suspension, 2 X 10
Best Uses:
Single Track, Urban Riding, Cross Country, Trails
Old guy getting back into again (55). After looking at hybreds, fitness and mountain bikes this puppy fit the bill. Test rode many bikes, many brands and talked with the staff on how I ride the fit was great. At only 5'6" tall the seat post was a little high and could not be lowered because of the accessory attachment bolts took an inch off and now the seat and fit is much improved. The X Caliber 9s'components are great improve over the 8 and well worth the extra $. 100 miles into ownership and I am loving it.
by jmarthsr from Keller Tx


Alpha Gold Aluminum, E2 tapered head tube, internal derailleur & dropper post routing, rack & kickstand mount, G2 Geometry
RockShox Recon RL, Solo Air, rebound, remote lockout, E2 tapered steerer, G2 Geometry w/51mm offset on 29ers, 100mm travel (13.5: 80mm travel)
Semi-integrated, cartridge, 1-1/8" top, 1.5" bottom
Front: Boost 110
Rear: Boost141
Bontrager Duster Elite Tubeless Ready 28-hole
Bontrager XR2 Team Issue, Tubeless Ready, 120 tpi, aramid bead, 29x2.20" (13.5 & 15.5: 27.5x2.20")
Shimano Deore XT
KMC X11-1
Front Derailleur
Shimano SLX M7020
Rear Derailleur
Shimano Deore XT M8000, Shadow Plus
Cassette/Rear Cogs
Shimano SLX M7000, 11-42, 11 speed
Shimano SLX M7000, 11 speed
Bontrager alloy, 31.8mm, 5mm rise, 720mm width
Bontrager Race Lite, lock-on
Bontrager Elite, 31.8mm, 7 degree
Brake Levers
Shimano M425 hydraulic disc
Shimano M425 hydraulic disc
Bontrager Evoke 2, chromoly rails
Seat Post
Bontrager alloy, 2-bolt head, 31.6mm, 8mm offset