2013 Trek Session vs 2015 Specialized Demo 8 Frameset
The SHORT is the Specialized Demo 8 Frameset size closest to your S Trek Session. 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 Specialized Demo 8 Frameset
Compared with the Trek Session in S, the Specialized Demo 8 Frameset in SHORT places the top of the head tube 9 mm higher and 12 mm further forward, relative to the bottom bracket. Its wheelbase is 18 mm longer, which can contribute to stability at speed.
- Frame stack
- +9 mm
- Higher front end
- Frame reach
- +12 mm
- Longer frame reach
- Wheelbase
- +18 mm
- Longer: steadier at speed
- Head angle
- −0.7°
- Slacker: calmer steering
- Chainstays
- −9 mm
- Shorter: livelier
The two frames
We can't draw these frames yet. The Trek Session numbers we have for size S are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Session S | Specialized Demo 8 Frameset SHORT | Difference |
|---|---|---|---|
| Reach | 383 | 395mm | +12 mm |
| Stack | 605 | 614mm | +9 mm |
| Head tube angle | 64.2° | 63.5° | −0.7° |
| Effective top tube | 566 | 577mm | +11 mm |
| Chainstay length | 439 | 430mm | −9 mm |
| Wheelbase | 1166 | 1184mm | +18 mm |
| BB drop | 21 | not listed | |
| BB height | 364 | 343mm | −21 mm |
| Standover | 780 | 702mm | −78 mm |
| Seat tube length | 413 | 394mm | −19 mm |
| Head tube length | 120 | not listed |
Differences are the Specialized Demo 8 Frameset minus the Trek Session. Full charts: 2013 Trek Session, 2015 Specialized Demo 8 Frameset.
Where each sits in its class
Trek SessionSpecialized Demo 8 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 Session8 | Specialized Demo 8 FramesetS-Works Frameset |
|---|---|---|
| Frame | Trek Alpha Platinum | not listed |
| Fork | RockShox BoXXer | not listed |
| Shifter | SRAM X7 | not listed |
| Derailleur | SRAM X-9 | not listed |
| Cassette | SRAM PG-1050 | not listed |
| Crankset | TruVativ Descendant DH | not listed |
| Pedals | Wellgo BO-87B | not listed |
| Wheelset | Sun Ringlé ADD Comp | not listed |
| Tire | Bontrager G4 Team Issue | not listed |
| Brake | Avid Code | not listed |
| Handlebar | Bontrager Rhythm Elite | not listed |
| Stem | TruVativ Holzfeller | not listed |
| Headset | FSA NO.57E | not listed |
| Seatpost | Bontrager Rhythm Elite | not listed |
| Saddle | Bontrager Evoke 1 | not listed |
| Rear shock | not listed | Öhlins TTX22M |
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