2019 Trek X-Caliber Frameset vs 2021 Specialized Rockhopper Comp
The XS is the Specialized Rockhopper Comp size closest to your S Trek X-Caliber Frameset. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the Specialized Rockhopper Comp
Compared with the Trek X-Caliber Frameset in S, the Specialized Rockhopper Comp in XS places the top of the head tube 16 mm lower and 9 mm further back, relative to the bottom bracket. Its wheelbase is 13 mm longer, which can contribute to stability at speed.
- Frame stack
- −16 mm
- Lower front end
- Frame reach
- −9 mm
- Shorter frame reach
- Wheelbase
- +13 mm
- Longer: steadier at speed
- Head angle
- −1.2°
- Slacker: calmer steering
- Chainstays
- +15 mm
- Longer: more planted
The two frames
We can't draw these frames yet. The Trek X-Caliber Frameset numbers we have for size S are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek X-Caliber Frameset S | Specialized Rockhopper Comp XS | Difference |
|---|---|---|---|
| Reach | 384 | 375mm | −9 mm |
| Stack | 575 | 559mm | −16 mm |
| Head tube angle | 69.2° | 68° | −1.2° |
| Effective top tube | 564 | not listed | |
| Chainstay length | 425 | 440mm | +15 mm |
| Wheelbase | 1054 | 1067mm | +13 mm |
| BB drop | 48 | not listed | |
| BB height | 306 | not listed | |
| Standover | 728 | 658mm | −70 mm |
| Seat tube length | 368 | 310mm | −58 mm |
| Head tube length | 90 | 95mm | +5 mm |
| Seat tube angle | not listed | 73.5° | |
| Fork length | not listed | 475mm |
Differences are the Specialized Rockhopper Comp minus the Trek X-Caliber Frameset. Full charts: 2019 Trek X-Caliber Frameset, 2021 Specialized Rockhopper Comp.
Where each sits in its class
Trek X-Caliber FramesetSpecialized Rockhopper Comp
Each bike is ranked against the other XC bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Trek X-Caliber FramesetX-Caliber Frameset | Specialized Rockhopper Comp |
|---|---|---|
| Frame | Trek Alpha Gold | not listed |
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