2019 Specialized Demo Expert 29 vs 2018 Trek Session 29 Frameset
The Trek Session 29 Frameset size closest to your S3 is the L. Compare the L instead
What changes on the Trek Session 29 Frameset
Compared with the Specialized Demo Expert 29 in S3, the Trek Session 29 Frameset in XL places the top of the head tube 17 mm lower and 20 mm further forward, relative to the bottom bracket. Its wheelbase is 22 mm longer, which can contribute to stability at speed.
- Frame stack
- −17 mm
- Lower front end
- Frame reach
- +20 mm
- Longer frame reach
- Wheelbase
- +22 mm
- Longer: steadier at speed
- Head angle
- −0.1°
- About the same head angle
- Chainstays
- +2 mm
- About the same
The two frames
Only the Specialized Demo Expert 29 is drawn. The Trek Session 29 Frameset numbers we have for size XL are missing the seat angle.
Geometry side by side
| Measurement | Specialized Demo Expert 29 S3 | Trek Session 29 Frameset XL | Difference |
|---|---|---|---|
| Reach | 445mm | 465 | +20 mm |
| Stack | 633mm | 616 | −17 mm |
| Head tube angle | 62.7° | 62.6° | −0.1° |
| Seat tube angle | 76.3° | not listed | |
| Effective top tube | 600mm | 633 | +33 mm |
| Chainstay length | 450mm | 452 | +2 mm |
| Wheelbase | 1271mm | 1293 | +22 mm |
| BB drop | 25mm | 16 | −9 mm |
| BB height | 350mm | 356 | +6 mm |
| Standover | 760mm | 749 | −11 mm |
| Seat tube length | 420mm | 456 | +36 mm |
| Head tube length | 105mm | 115 | +10 mm |
Differences are the Trek Session 29 Frameset minus the Specialized Demo Expert 29. Full charts: 2019 Specialized Demo Expert 29, 2018 Trek Session 29 Frameset.
Where each sits in its class
Specialized Demo Expert 29Trek Session 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 Expert 29Expert 29 | Trek Session 29 Frameset29 Frameset |
|---|---|---|
| Fork | RockShox BoXXer RC 29 | Fox 40 Factory |
| Rear shock | RockShox Super Deluxe RC World | not listed |
| Shifter | SRAM GX | not listed |
| Derailleur | SRAM GX | not listed |
| Cassette | SRAM PG-1030 | not listed |
| Chain | SRAM PC-1031 | not listed |
| Crankset | SRAM Descendant | not listed |
| Tire | Specialized Butcher BLCK DMND | not listed |
| Brake | SRAM Code R | not listed |
| Stem | Specialized two-piece | not listed |
| Grips | Specialized Sip Grip | not listed |
| Saddle | Specialized Henge DH | not listed |
| Frame | not listed | Trek OCLV |
| Headset | not listed | FSA Orbit |
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