2020 Specialized Demo Race 29 vs 2022 Trek Session C 27.5 Frameset
The Trek Session C 27.5 Frameset size closest to your S3 is the L. Compare the L instead
What changes on the Trek Session C 27.5 Frameset
Compared with the Specialized Demo Race 29 in S3, the Trek Session C 27.5 Frameset in XL places the top of the head tube 17 mm lower and 30 mm further forward, relative to the bottom bracket. Its wheelbase is 8 mm longer, which can contribute to stability at speed.
- Frame stack
- −17 mm
- Lower front end
- Frame reach
- +30 mm
- Longer frame reach
- Wheelbase
- +8 mm
- Longer: steadier at speed
- Head angle
- +0.8°
- Steeper: sharper steering
- Chainstays
- −5 mm
- Shorter: livelier
The two frames
Only the Specialized Demo Race 29 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 29 S3 | Trek Session C 27.5 Frameset XL | Difference |
|---|---|---|---|
| Reach | 445mm | 475 | +30 mm |
| Stack | 633mm | 616 | −17 mm |
| Head tube angle | 62.7° | 63.5° | +0.8° |
| Seat tube angle | 76.3° | not listed | |
| Chainstay length | 450mm | 445 | −5 mm |
| Wheelbase | 1273mm | 1281 | +8 mm |
| BB drop | 25mm | 20 | −5 mm |
| BB height | 350mm | 356 | +6 mm |
| Standover | 760mm | 748 | −12 mm |
| Seat tube length | 420mm | 456 | +36 mm |
| Head tube length | 105mm | 115 | +10 mm |
| Effective top tube | not listed | 631 |
Differences are the Trek Session C 27.5 Frameset minus the Specialized Demo Race 29. Full charts: 2020 Specialized Demo Race 29, 2022 Trek Session C 27.5 Frameset.
Where each sits in its class
Specialized Demo Race 29Trek 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 29Race 29 | Trek Session C 27.5 Frameset27.5 Frameset |
|---|---|---|
| Rear shock | Öhlins TTX | not listed |
| Saddle | Specialized Henge DH | not listed |
| Frame | not listed | Trek OCLV |
| Headset | not listed | FSA Orbit |
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