2023 Trek Session C 27.5 Frameset vs 2025 Trek Session
We can't match sizes for these two: one of them has no stack and reach for the sizes shown.
What changes on the Trek Session
- Frame stack
- n/a
- One of the bikes has no number for this
- Frame reach
- n/a
- One of the bikes has no number for this
- Wheelbase
- +61 mm
- Longer: steadier at speed
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Session C 27.5 Frameset numbers we have for size S are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Session C 27.5 Frameset S | Trek Session R2 | Difference |
|---|---|---|---|
| Reach | 410 | not listed | |
| Stack | 616 | not listed | |
| Head tube angle | 63.5° | 63 | −0.5° |
| Effective top tube | 579 | 618 | +39 mm |
| Chainstay length | 445 | 445 | ±0 mm |
| Wheelbase | 1216 | 1277 | +61 mm |
| BB drop | 20 | not listed | |
| BB height | 356 | not listed | |
| Standover | 738 | 751 | +13 mm |
| Seat tube length | 425 | not listed | |
| Head tube length | 115 | not listed |
Differences are the Trek Session minus the Trek Session C 27.5 Frameset. Full charts: 2023 Trek Session C 27.5 Frameset, 2025 Trek Session.
Where each sits in its class
Trek Session C 27.5 FramesetTrek Session
AggressivePositionUpright
CalmSteeringQuick
PlayfulBalancePlanted
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 Session8 |
|---|---|---|
| Frame | Trek OCLV | Trek Session 8 |
| Headset | FSA Orbit | not listed |
| Fork | not listed | RockShox BoXXer |
| Rear shock | not listed | Marzocchi Bomber |
| Cassette | not listed | SRAM GX DH |
| Chain | not listed | SRAM PC 1110 |
| Crankset | not listed | TruVativ Descendant GX |
| Chainring | not listed | TruVativ 34 |
| Pedals | not listed | Wellgo BO-87B |
| Wheelset | not listed | Bontrager Line DH 30 |
| Tire | not listed | Bontrager G5 Team Issue, Bontrager G5 |
| 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 |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
