2023 Specialized Demo Expert vs 2023 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 Expert in S3, the Trek Session C 27.5 Frameset in M places the top of the head tube 16 mm lower and 17 mm further back, relative to the bottom bracket. Its wheelbase is 24 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −16 mm
- Lower front end
- Frame reach
- −17 mm
- Shorter frame reach
- Wheelbase
- −24 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 Expert is drawn. The Trek Session C 27.5 Frameset numbers we have for size M are missing the seat angle.
Geometry side by side
| Measurement | Specialized Demo Expert S3 | Trek Session C 27.5 Frameset M | Difference |
|---|---|---|---|
| Reach | 446mm | 429 | −17 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 | 1259mm | 1235 | −24 mm |
| Seat tube length | 420mm | 425 | +5 mm |
| Head tube length | 105mm | 115 | +10 mm |
| Effective top tube | not listed | 584 | |
| BB drop | not listed | 20 | |
| BB height | not listed | 356 | |
| Standover | not listed | not listed |
Differences are the Trek Session C 27.5 Frameset minus the Specialized Demo Expert. Full charts: 2023 Specialized Demo Expert, 2023 Trek Session C 27.5 Frameset.
Where each sits in its class
Specialized Demo ExpertTrek 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 ExpertExpert | Trek Session C 27.5 Frameset27.5 Frameset |
|---|---|---|
| Fork | RockShox BoXXer 29 | not listed |
| Rear shock | RockShox Super Deluxe Select | not listed |
| Shifter | SRAM GX DH | not listed |
| Derailleur | SRAM GX DH | not listed |
| Cassette | SRAM GX DH | not listed |
| Chain | SRAM PC1110 | not listed |
| Crankset | Specialized DESCENDANT DH | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Tire | Specialized Butcher | not listed |
| Brake | SRAM Code RS | not listed |
| Stem | Specialized Descendant | not listed |
| Saddle | Specialized Henge DH | not listed |
| Frame | not listed | Trek OCLV |
| Headset | not listed | FSA Orbit |
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