2024 Specialized Demo Race vs 2023 Trek Session C 27.5 Frameset
The XL is the Trek Session C 27.5 Frameset size closest to your S4 Specialized Demo Race. 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 Session C 27.5 Frameset
Compared with the Specialized Demo Race in S4, the Trek Session C 27.5 Frameset in XL places the top of the head tube 16 mm lower and 9 mm further forward, relative to the bottom bracket. Its wheelbase is 3 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −16 mm
- Lower front end
- Frame reach
- +9 mm
- Longer frame reach
- Wheelbase
- −3 mm
- Shorter: quicker to change direction
- Head angle
- +0.7°
- Steeper: sharper steering
- Chainstays
- −3 mm
- Shorter: livelier
The two frames
Only the Specialized Demo Race is drawn. The Trek Session C 27.5 Frameset numbers we have for size XL are missing the seat angle.
Geometry side by side
| Measurement | Specialized Demo Race S4 | Trek Session C 27.5 Frameset XL | Difference |
|---|---|---|---|
| Reach | 466mm | 475 | +9 mm |
| Stack | 632mm | 616 | −16 mm |
| Head tube angle | 62.8° | 63.5° | +0.7° |
| Seat tube angle | 76.8° | not listed | |
| Chainstay length | 448mm | 445 | −3 mm |
| Wheelbase | 1284mm | 1281 | −3 mm |
| Seat tube length | 420mm | 456 | +36 mm |
| Head tube length | 105mm | 115 | +10 mm |
| Effective top tube | not listed | 631 | |
| BB drop | not listed | 20 | |
| BB height | not listed | 356 | |
| Standover | not listed | 748 |
Differences are the Trek Session C 27.5 Frameset minus the Specialized Demo Race. Full charts: 2024 Specialized Demo Race, 2023 Trek Session C 27.5 Frameset.
Where each sits in its class
Specialized Demo RaceTrek Session C 27.5 Frameset
Each bike is ranked against the other downhill 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 Demo Race | Trek Session C 27.5 Frameset27.5 Frameset |
|---|---|---|
| Frame | not listed | Trek OCLV |
| Headset | not listed | FSA Orbit |
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