2018 Trek Session C 27.5 Frameset vs 2018 Trek Session 29 Frameset
The M is the Trek Session 29 Frameset size closest to your M 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 29 Frameset
Compared with the Trek Session C 27.5 Frameset in M, the Trek Session 29 Frameset in M places the top of the head tube at about the same height and 9 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
- −9 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 M are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Session C 27.5 Frameset M | Trek Session 29 Frameset M | Difference |
|---|---|---|---|
| Reach | 429 | 420 | −9 mm |
| Stack | 616 | 616 | ±0 mm |
| Head tube angle | 63.5° | 62.6° | −0.9° |
| Effective top tube | 584 | 587 | +3 mm |
| Chainstay length | 445 | 452 | +7 mm |
| Wheelbase | 1235 | 1247 | +12 mm |
| BB drop | 20 | 16 | −4 mm |
| BB height | 356 | 356 | ±0 mm |
| Standover | not listed | 742 | |
| Seat tube length | 425 | 425 | ±0 mm |
| Head tube length | 115 | 115 | ±0 mm |
Differences are the Trek Session 29 Frameset minus the Trek Session C 27.5 Frameset. Full charts: 2018 Trek Session C 27.5 Frameset, 2018 Trek Session 29 Frameset.
Where each sits in its class
Trek Session C 27.5 FramesetTrek 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 | Trek Session C 27.5 Frameset27.5 Frameset | Trek Session 29 Frameset29 Frameset |
|---|---|---|
| Frame | Trek OCLV | Trek OCLV |
| Headset | FSA Orbit | FSA Orbit |
| Fork | not listed | Fox 40 Factory |
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