2021 Specialized Demo Expert vs 2019 Trek Session C 29 Frameset
The XL is the Trek Session C 29 Frameset size closest to your S4 Specialized Demo Expert. 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 29 Frameset
Compared with the Specialized Demo Expert in S4, the Trek Session C 29 Frameset in XL places the top of the head tube 16 mm lower and about as far forward, relative to the bottom bracket.
- Frame stack
- −16 mm
- Lower front end
- Frame reach
- −1 mm
- About the same reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- −0.2°
- About the same head angle
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
We can't draw these frames yet. The Specialized Demo Expert numbers we have for size S4 are missing the chainstay length and wheelbase. The numbers below still compare.
Geometry side by side
| Measurement | Specialized Demo Expert S4 | Trek Session C 29 Frameset XL | Difference |
|---|---|---|---|
| Reach | 466mm | 465 | −1 mm |
| Stack | 632mm | 616 | −16 mm |
| Head tube angle | 62.8° | 62.6° | −0.2° |
| Seat tube angle | 76.8° | not listed | |
| Seat tube length | 420mm | 456 | +36 mm |
| Head tube length | 105mm | 115 | +10 mm |
| Effective top tube | not listed | 633 | |
| Chainstay length | not listed | 452 | |
| Wheelbase | not listed | 1293 | |
| BB drop | not listed | 16 | |
| BB height | not listed | 356 | |
| Standover | not listed | 749 |
Differences are the Trek Session C 29 Frameset minus the Specialized Demo Expert. Full charts: 2021 Specialized Demo Expert, 2019 Trek Session C 29 Frameset.
Where each sits in its class
Specialized Demo ExpertTrek Session C 29 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 29 Frameset29 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 BLCK DMND | not listed |
| Brake | SRAM Code RS | not listed |
| Stem | Specialized two-piece | not listed |
| Saddle | Specialized Henge DH | not listed |
| Frame | not listed | Trek OCLV |
| Headset | not listed | FSA Orbit |
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