2017 Trek Session 9.9 DH 27.5 Race Shop Limited vs 2019 Specialized Demo Alloy 27.5
The M is the Specialized Demo Alloy 27.5 size closest to your M Trek Session 9.9 DH 27.5 Race Shop Limited. 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 Alloy 27.5
Compared with the Trek Session 9.9 DH 27.5 Race Shop Limited in M, the Specialized Demo Alloy 27.5 in M places the top of the head tube 11 mm higher and 12 mm further forward, relative to the bottom bracket. Its wheelbase is 3 mm longer, which can contribute to stability at speed.
- Frame stack
- +11 mm
- Higher front end
- Frame reach
- +12 mm
- Longer frame reach
- Wheelbase
- +3 mm
- Longer: steadier at speed
- Head angle
- −0.7°
- Slacker: calmer steering
- Chainstays
- −13 mm
- Shorter: livelier
The two frames
We can't draw these frames yet. The Trek Session 9.9 DH 27.5 Race Shop Limited numbers we have for size M are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Session 9.9 DH 27.5 Race Shop Limited M | Specialized Demo Alloy 27.5 M | Difference |
|---|---|---|---|
| Reach | 408 | 420mm | +12 mm |
| Stack | 603 | 614mm | +11 mm |
| Head tube angle | 64.2° | 63.5° | −0.7° |
| Effective top tube | 590 | 596mm | +6 mm |
| Chainstay length | 443 | 430mm | −13 mm |
| Wheelbase | 1205 | 1208mm | +3 mm |
| BB drop | 9 | 12mm | +3 mm |
| BB height | 364 | 342mm | −22 mm |
| Standover | 793 | 698mm | −95 mm |
| Seat tube length | 426 | 394mm | −32 mm |
| Head tube length | 115 | 105mm | −10 mm |
| Seat tube angle | not listed | 74° |
Differences are the Specialized Demo Alloy 27.5 minus the Trek Session 9.9 DH 27.5 Race Shop Limited. Full charts: 2017 Trek Session 9.9 DH 27.5 Race Shop Limited, 2019 Specialized Demo Alloy 27.5.
Where each sits in its class
Trek Session 9.9 DH 27.5 Race Shop LimitedSpecialized Demo Alloy 27.5
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 9.9 DH 27.5 Race Shop Limited9.9 DH 27.5 Race Shop Limited | Specialized Demo Alloy 27.5Alloy 27.5 |
|---|---|---|
| Frame | Trek OCLV | not listed |
| Fork | Fox 40 Factory | RockShox BoXXer RC 27.5 |
| Shifter | Shimano Saint | SRAM GX |
| Derailleur | Shimano Saint | SRAM GX |
| Cassette | Shimano Ultegra | SRAM PG-1030 |
| Chain | Shimano XTR | SRAM PC-1031 |
| Crankset | Shimano Saint | SRAM Descendant |
| Pedals | Wellgo MG-1 | not listed |
| Wheelset | DT Swiss FR1950 Gravity Classic | not listed |
| Tire | Bontrager G4 Team Issue | Specialized Butcher |
| Brake | Shimano Saint | SRAM Guide RE |
| Handlebar | Bontrager Line | not listed |
| Stem | Race Face Atlas | Specialized two-piece |
| Seatpost | Bontrager Rhythm Elite | not listed |
| Saddle | Bontrager Evoke 3 | Specialized Phenom Comp |
| Rear shock | not listed | Fox Van RC |
| Grips | not listed | Specialized Sip Grip |
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