2022 Trek Session C 27.5 Frameset vs 2021 Trek Session 9.9 29
The XL is the Trek Session 9.9 29 size closest to your XL Trek Session C 27.5 Frameset. 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 9.9 29
Compared with the Trek Session C 27.5 Frameset in XL, the Trek Session 9.9 29 in XL places the top of the head tube at about the same height and 10 mm further back, relative to the bottom bracket. Its wheelbase is 12 mm longer, which can contribute to stability at speed.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- −10 mm
- Shorter frame reach
- Wheelbase
- +12 mm
- Longer: steadier at speed
- Head angle
- −0.9°
- Slacker: calmer steering
- Chainstays
- +7 mm
- Longer: more planted
The two frames
We can't draw these frames yet. The Trek Session C 27.5 Frameset numbers we have for size XL are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Session C 27.5 Frameset XL | Trek Session 9.9 29 XL | Difference |
|---|---|---|---|
| Reach | 475 | 465 | −10 mm |
| Stack | 616 | 616 | ±0 mm |
| Head tube angle | 63.5° | 62.6° | −0.9° |
| Effective top tube | 631 | 647 | +16 mm |
| Chainstay length | 445 | 452 | +7 mm |
| Wheelbase | 1281 | 1293 | +12 mm |
| BB drop | 20 | 16 | −4 mm |
| BB height | 356 | 356 | ±0 mm |
| Standover | 748 | 751 | +3 mm |
| Seat tube length | 456 | 456 | ±0 mm |
| Head tube length | 115 | 115 | ±0 mm |
| Seat tube angle | not listed | 73.6° |
Differences are the Trek Session 9.9 29 minus the Trek Session C 27.5 Frameset. Full charts: 2022 Trek Session C 27.5 Frameset, 2021 Trek Session 9.9 29.
Where each sits in its class
Trek Session C 27.5 FramesetTrek Session 9.9 29
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 | Trek Session C 27.5 Frameset27.5 Frameset | Trek Session 9.9 299.9 29 |
|---|---|---|
| Frame | Trek OCLV | Trek OCLV |
| Headset | FSA Orbit | FSA Orbit |
| Fork | not listed | RockShox BoXXer Ultimate |
| Shifter | not listed | SRAM X0 1 DH |
| Derailleur | not listed | SRAM X01 DH |
| Cassette | not listed | SRAM GX DH |
| Chain | not listed | SRAM PC1110 |
| Crankset | not listed | SRAM X01 DH |
| Bottom bracket | not listed | SRAM DUB |
| Pedals | not listed | Wellgo MG-1 |
| Wheelset | not listed | Bontrager Line DH 30 |
| Tire | not listed | Bontrager G5 Team Issue |
| Brake | not listed | SRAM Code RSC |
| Handlebar | not listed | Bontrager Line |
| Stem | not listed | Bontrager Line |
| Seatpost | not listed | Bontrager Rhythm Elite |
| Saddle | not listed | Bontrager Arvada |
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