2021 Specialized Rockhopper Expert vs 2019 Trek X-Caliber Frameset
The XS is the Trek X-Caliber Frameset size closest to your XS Specialized Rockhopper Expert. 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 Trek X-Caliber Frameset
Compared with the Specialized Rockhopper Expert in XS, the Trek X-Caliber Frameset in XS places the top of the head tube 7 mm higher and about as far forward, relative to the bottom bracket. Its wheelbase is 31 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +7 mm
- Higher front end
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- −31 mm
- Shorter: quicker to change direction
- Head angle
- +1.2°
- Steeper: sharper steering
- Chainstays
- −15 mm
- Shorter: livelier
The two frames
Only the Specialized Rockhopper Expert is drawn. The Trek X-Caliber Frameset numbers we have for size XS are missing the seat angle.
Geometry side by side
| Measurement | Specialized Rockhopper Expert XS | Trek X-Caliber Frameset XS | Difference |
|---|---|---|---|
| Reach | 375mm | 375 | ±0 mm |
| Stack | 559mm | 566 | +7 mm |
| Head tube angle | 68° | 69.2° | +1.2° |
| Seat tube angle | 73.5° | not listed | |
| Chainstay length | 440mm | 425 | −15 mm |
| Wheelbase | 1067mm | 1036 | −31 mm |
| Standover | 658mm | 708 | +50 mm |
| Seat tube length | 310mm | 343 | +33 mm |
| Fork length | 475mm | not listed | |
| Head tube length | 95mm | 90 | −5 mm |
| Effective top tube | not listed | 538 | |
| BB drop | not listed | 58 | |
| BB height | not listed | 296 |
Differences are the Trek X-Caliber Frameset minus the Specialized Rockhopper Expert. Full charts: 2021 Specialized Rockhopper Expert, 2019 Trek X-Caliber Frameset.
Where each sits in its class
Specialized Rockhopper ExpertTrek X-Caliber Frameset
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 | Specialized Rockhopper ExpertExpert | Trek X-Caliber FramesetX-Caliber Frameset |
|---|---|---|
| Frame | Specialized A1 premium butted | Trek Alpha Gold |
| Fork | RockShox Judy | not listed |
| Shifter | SRAM SX Eagle | not listed |
| Derailleur | SRAM SX Eagle | not listed |
| Cassette | SRAM SX Eagle | not listed |
| Chain | SRAM SX Eagle | not listed |
| Crankset | SRAM SX Eagle | not listed |
| Bottom bracket | SRAM PowerSpline | not listed |
| Wheelset | e*thirteen SL | not listed |
| Tire | Specialized Ground Control | not listed |
| Hub | Shimano HB-RM35, Shimano FH-RM35 | not listed |
| Rim | Specialized hookless | not listed |
| Brake | Shimano MT200 | not listed |
| Rotor | Shimano MT200 | not listed |
| Handlebar | Specialized alloy | not listed |
| Stem | Specialized Stout | not listed |
| Grips | Specialized Trail | not listed |
| Saddle | Specialized Bridge Sport | not listed |
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