2025 Specialized Demo Race vs 2023 Trek Session C 27.5 Frameset
The L is the Trek Session C 27.5 Frameset size closest to your S3 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 S3, the Trek Session C 27.5 Frameset in L places the top of the head tube 16 mm lower and 4 mm further forward, relative to the bottom bracket. Its wheelbase is 8 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −16 mm
- Lower front end
- Frame reach
- +4 mm
- Longer frame reach
- Wheelbase
- −8 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 L are missing the seat angle.
Geometry side by side
| Measurement | Specialized Demo Race S3 | Trek Session C 27.5 Frameset L | Difference |
|---|---|---|---|
| Reach | 446mm | 450 | +4 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 | 1264mm | 1256 | −8 mm |
| BB drop | 25mm | 20 | −5 mm |
| BB height | 350mm | 356 | +6 mm |
| Seat tube length | 420mm | 456 | +36 mm |
| Head tube length | 105mm | 115 | +10 mm |
| Effective top tube | not listed | 606 | |
| Standover | not listed | 746 |
Differences are the Trek Session C 27.5 Frameset minus the Specialized Demo Race. Full charts: 2025 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 RaceRace | Trek Session C 27.5 Frameset27.5 Frameset |
|---|---|---|
| Fork | Öhlins DH38 M.1 29 | not listed |
| Rear shock | Öhlins TTX22 M.2 | 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 Cannibal | not listed |
| Hub | DT Swiss 350 | not listed |
| Rim | Roval Traverse | not listed |
| Brake | SRAM Maven Ultimate | not listed |
| Handlebar | Renthal Fatbar 35 | not listed |
| Stem | Renthal Integra | not listed |
| Grips | Deity Lockjaw | not listed |
| Saddle | Specialized Henge DH | not listed |
| Frame | not listed | Trek OCLV |
| Headset | not listed | FSA Orbit |
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