2019 Specialized Demo Race 29 vs 2021 Trek Session C 27.5 Frameset
The L is the Trek Session C 27.5 Frameset size closest to your S3 Specialized Demo Race 29. 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 29 in S3, the Trek Session C 27.5 Frameset in L places the top of the head tube 17 mm lower and 5 mm further forward, relative to the bottom bracket. Its wheelbase is 17 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −17 mm
- Lower front end
- Frame reach
- +5 mm
- Longer frame reach
- Wheelbase
- −17 mm
- Shorter: quicker to change direction
- 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 L are missing the seat angle.
Geometry side by side
| Measurement | Specialized Demo Race 29 S3 | Trek Session C 27.5 Frameset L | Difference |
|---|---|---|---|
| Reach | 445mm | 450 | +5 mm |
| Stack | 633mm | 616 | −17 mm |
| Head tube angle | 62.7° | 63.5° | +0.8° |
| Seat tube angle | 76.3° | not listed | |
| Effective top tube | 600mm | 606 | +6 mm |
| Chainstay length | 450mm | 445 | −5 mm |
| Wheelbase | 1273mm | 1256 | −17 mm |
| BB drop | 25mm | 20 | −5 mm |
| BB height | 350mm | 356 | +6 mm |
| Standover | 760mm | 746 | −14 mm |
| Seat tube length | 420mm | 456 | +36 mm |
| Head tube length | 105mm | 115 | +10 mm |
Differences are the Trek Session C 27.5 Frameset minus the Specialized Demo Race 29. Full charts: 2019 Specialized Demo Race 29, 2021 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 |
| Shifter | SRAM X01 DH | not listed |
| Derailleur | SRAM X01 DH | not listed |
| Cassette | SRAM X01 DH | not listed |
| Chain | SRAM PC-1130 | not listed |
| Crankset | SRAM X01 DH | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Tire | Specialized Butcher BLCK DMND | not listed |
| Hub | DT Swiss 350 | not listed |
| Brake | SRAM Code RSC | not listed |
| Stem | Specialized two-piece | not listed |
| Grips | Deity Knuckleduster | not listed |
| Saddle | Specialized Henge DH | not listed |
| Frame | not listed | Trek OCLV |
| Headset | not listed | FSA Orbit |
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