2015 Trek Session DH 27.5 vs 2016 Specialized Demo
The Specialized Demo size closest to your M is the M. Compare the M instead
What changes on the Specialized Demo
Compared with the Trek Session DH 27.5 in M, the Specialized Demo in XL places the top of the head tube 11 mm higher and 52 mm further forward, relative to the bottom bracket. Its wheelbase is 43 mm longer, which can contribute to stability at speed.
- Frame stack
- +11 mm
- Higher front end
- Frame reach
- +52 mm
- Longer frame reach
- Wheelbase
- +43 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 DH 27.5 numbers we have for size M are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Session DH 27.5 M | Specialized Demo XL | Difference |
|---|---|---|---|
| Reach | 408 | 460 | +52 mm |
| Stack | 603 | 614 | +11 mm |
| Head tube angle | 64.2° | 63.5 | −0.7° |
| Effective top tube | 590 | 636 | +46 mm |
| Chainstay length | 443 | 430 | −13 mm |
| Wheelbase | 1205 | 1248 | +43 mm |
| BB drop | 14 | 12 | −2 mm |
| BB height | 364 | 342 | −22 mm |
| Standover | 793 | 698 | −95 mm |
| Seat tube length | 390 | 419 | +29 mm |
| Head tube length | 115 | 105 | −10 mm |
| Seat tube angle | not listed | 74 |
Differences are the Specialized Demo minus the Trek Session DH 27.5. Full charts: 2015 Trek Session DH 27.5, 2016 Specialized Demo.
Where each sits in its class
Trek Session DH 27.5Specialized Demo
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 DH 27.588 DH 27.5 | Specialized DemoS-Works 8 |
|---|---|---|
| Frame | Trek Alpha Platinum | not listed |
| Fork | RockShox BoXXer | RockShox Boxxer Team |
| Shifter | SRAM X9 | SRAM X01 DH |
| Derailleur | SRAM X-0 | SRAM X01 DH |
| Cassette | SRAM PG-1050 | SRAM X01 DH |
| Chain | KMC X10 | SRAM PC-1130 |
| Crankset | TruVativ Descendant DH | SRAM X0 DH |
| Pedals | Wellgo MG-1 | Specialized Boomslang |
| Wheelset | DT Swiss FR2150 | not listed |
| Tire | Bontrager G4 Team Issue | Specialized Butcher DH, Specialized Slaughter DH |
| Brake | Avid Code | SRAM Guide RS |
| Handlebar | Bontrager Rhythm Elite | S Works DH |
| Stem | Bontrager Rhythm | Specialized P.Series |
| Headset | FSA NO.57E | not listed |
| Seatpost | Bontrager Rhythm Elite | Thomson alloy |
| Saddle | Bontrager Evoke 2 | Specialized Phenom Expert |
| Bottom bracket | not listed | SRAM BB30 |
| Hub | not listed | DT Swiss Star Ratchet |
| Rim | not listed | Roval 650b |
| Grips | not listed | Specialized Sip Grip |
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