2016 Trek Session 9.9 vs 2018 Trek Session C 27.5 Frameset
The L is the Trek Session C 27.5 Frameset size closest to your XL Trek Session 9.9. 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 27.5 Frameset
Compared with the Trek Session 9.9 in XL, the Trek Session C 27.5 Frameset in L places the top of the head tube 13 mm higher and 6 mm further back, relative to the bottom bracket. Its wheelbase is 3 mm longer, which can contribute to stability at speed.
- Frame stack
- +13 mm
- Higher front end
- Frame reach
- −6 mm
- Shorter frame reach
- Wheelbase
- +3 mm
- Longer: steadier at speed
- Head angle
- −0.7°
- Slacker: calmer steering
- Chainstays
- +2 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Session 9.9 numbers we have for size XL are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Session 9.9 XL | Trek Session C 27.5 Frameset L | Difference |
|---|---|---|---|
| Reach | 456 | 450 | −6 mm |
| Stack | 603 | 616 | +13 mm |
| Head tube angle | 64.2° | 63.5° | −0.7° |
| Effective top tube | 638 | 606 | −32 mm |
| Chainstay length | 443 | 445 | +2 mm |
| Wheelbase | 1253 | 1256 | +3 mm |
| BB drop | 9 | 20 | +11 mm |
| BB height | 364 | 356 | −8 mm |
| Standover | 775 | 746 | −29 mm |
| Seat tube length | 456 | 456 | ±0 mm |
| Head tube length | 115 | 115 | ±0 mm |
Differences are the Trek Session C 27.5 Frameset minus the Trek Session 9.9. Full charts: 2016 Trek Session 9.9, 2018 Trek Session C 27.5 Frameset.
Where each sits in its class
Trek Session 9.9Trek Session C 27.5 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 9.99.9 | Trek Session C 27.5 Frameset27.5 Frameset |
|---|---|---|
| Frame | Trek OCLV | Trek OCLV |
| Fork | Fox 40 Factory | not listed |
| Shifter | Shimano Saint | not listed |
| Derailleur | Shimano Saint | not listed |
| Cassette | Shimano Ultegra | not listed |
| Chain | Shimano XTR | not listed |
| Crankset | Shimano Saint | not listed |
| Pedals | Wellgo MG-1 | not listed |
| Wheelset | DT Swiss FR1950 Gravity Classic | not listed |
| Tire | Bontrager G4 Team Issue | not listed |
| Brake | Shimano Saint | not listed |
| Handlebar | Bontrager Rhythm | not listed |
| Headset | Cane Creek IS-3 | FSA Orbit |
| Seatpost | Bontrager Rhythm Elite | not listed |
| Saddle | Bontrager Evoke 3 | not listed |
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
