Trek x-caliber frameset

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X-Caliber frameset is a high-value alloy mountain bike frameset for fast singletrack rides. Lightweight Alpha Aluminum tubes, shorter chainstays for extra agility, and an incredible amount of versatility make it a great starting point for your cross country mountain bike.
  • It gets you into the world of cross country riding and racing at a great price, and its a mountain bike that can grow with you as your skills advance
  • The sleek internal cable routing gives you clean looks, protects your cables, and makes it easy to upgrade to a dropper post for even more capability
  • The frame is fully compatible with higher-end parts, like race wheels and a dropper post
  • Mounts on the frame make it easy to add a rear rack if your XC bike doubles as your daily commuter

High tech frame

The Alpha Gold Aluminum frame is packed with features that make your ride better. A tapered head tube gives you more precise, confident handling on the front end, while Boost 141 rear hub spacing gives you shorter chainstays for more nimble handling out back.


Frame Alpha Gold Aluminum, tapered head tube, internal derailleur & dropper post routing, rack & kickstand mount, Boost141, 5mm QR
Seat Collar Bolt-on, 36.4mm
Headset Semi-integrated, loose ball bearing, 1-1/8 top, 1.5 bottom

Geometry Chart

B B Drop 5.8
B B Height 29.2
Chainstay Length 42.5
Eff Seat Tube Angle 73.5°
Eff Top Tube 54.4
Frame Reach 37.6
Frame Size Letter XS
Frame Size Number 13.5"
Frame Stack 56.5
Head Angle 69.3°
Head Tube Length 9
Offset 4.2
Seat Tube 34.3
Seat Tube Angle 73.5°
Standover 69.8
Trail 8.8
Wheelbase 103.6
Wheel Size 27.5"
B B Drop 5.8
B B Height 29.2
Chainstay Length 42.5
Eff Seat Tube Angle 73.5°
Eff Top Tube 54.4
Frame Reach 37.6
Frame Size Letter XS
Frame Size Number 13.5"
Frame Stack 56.5
Head Angle 69.3°
Head Tube Length 9
Offset 4.2
Seat Tube 34.3
Seat Tube Angle 73.5°
Standover 69.8
Trail 8.8
Wheelbase 103.6
Wheel Size 27.5"
B B Drop 4.8
B B Height 30.2
Chainstay Length 42.5
Eff Seat Tube Angle 73.5°
Eff Top Tube 55.5
Frame Reach 38.5
Frame Size Letter S
Frame Size Number 15.5"
Frame Stack 57.4
Head Angle 69.3°
Head Tube Length 9
Offset 4.2
Seat Tube 36.8
Seat Tube Angle 73.5°
Standover 72.4
Trail 8.8
Wheelbase 105.3
Wheel Size 27.5"
B B Drop 4.8
B B Height 30.2
Chainstay Length 42.5
Eff Seat Tube Angle 73.5°
Eff Top Tube 55.5
Frame Reach 38.5
Frame Size Letter S
Frame Size Number 15.5"
Frame Stack 57.4
Head Angle 69.3°
Head Tube Length 9
Offset 4.2
Seat Tube 36.8
Seat Tube Angle 73.5°
Standover 72.4
Trail 8.8
Wheelbase 105.3
Wheel Size 27.5"
B B Drop 5.8
B B Height 31.1
Chainstay Length 43.8
Eff Seat Tube Angle 73.0°
Eff Top Tube 60.1
Frame Reach 41.8
Frame Size Letter M
Frame Size Number 17.5"
Frame Stack 59.8
Head Angle 69.5°
Head Tube Length 9
Offset 4.2
Seat Tube 41.9
Seat Tube Angle 71.9°
Standover 74.8
Trail 9.4
Wheelbase 110.9
Wheel Size 29"
B B Drop 5.8
B B Height 31
Chainstay Length 43.8
Eff Seat Tube Angle 73.0°
Eff Top Tube 61.7
Frame Reach 43.4
Frame Size Letter ML
Frame Size Number 18.5"
Frame Stack 59.8
Head Angle 69.5°
Head Tube Length 9
Offset 4.2
Seat Tube 44.4
Seat Tube Angle 71.9°
Standover 75.7
Trail 9.4
Wheelbase 112.5
Wheel Size 29"
B B Drop 5.8
B B Height 31
Chainstay Length 43.8
Eff Seat Tube Angle 73.0°
Eff Top Tube 63.7
Frame Reach 45.1
Frame Size Letter L
Frame Size Number 19.5"
Frame Stack 60.8
Head Angle 69.5°
Head Tube Length 10
Offset 4.2
Seat Tube 47
Seat Tube Angle 71.9°
Standover 75.7
Trail 9.4
Wheelbase 114.5
Wheel Size 29"
B B Drop 5.8
B B Height 31
Chainstay Length 43.8
Eff Seat Tube Angle 73.0°
Eff Top Tube 65.8
Frame Reach 46.6
Frame Size Letter XL
Frame Size Number 21.5"
Frame Stack 62.7
Head Angle 69.5°
Head Tube Length 12
Offset 4.2
Seat Tube 52.1
Seat Tube Angle 71.9°
Standover 76.8
Trail 9.4
Wheelbase 116.7
Wheel Size 29"
B B Drop 5.8
B B Height 31.1
Chainstay Length 43.8
Eff Seat Tube Angle 73.0°
Eff Top Tube 67.2
Frame Reach 48
Frame Size Letter XXL
Frame Size Number 23.0"
Frame Stack 62.7
Head Angle 69.5°
Head Tube Length 12
Offset 4.2
Seat Tube 55.9
Seat Tube Angle 71.9°
Standover 80.4
Trail 9.4
Wheelbase 118.1
Wheel Size 29"