2023 Specialized Demo Expert 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
- +18 mm
- Longer: steadier at speed
- Head angle
- +0.2°
- About the same head angle
- Chainstays
- −3 mm
- Shorter: livelier
The two frames
Only the Specialized Demo Expert is drawn. The Trek Session numbers we have for size R2 are missing the reach, stack and seat angle.
Geometry side by side
| Measurement | Specialized Demo Expert S3 | Trek Session R2 | Difference |
|---|---|---|---|
| Reach | 446mm | not listed | |
| Stack | 632mm | not listed | |
| Head tube angle | 62.8° | 63 | +0.2° |
| Seat tube angle | 76.8° | not listed | |
| Chainstay length | 448mm | 445 | −3 mm |
| Wheelbase | 1259mm | 1277 | +18 mm |
| Seat tube length | 420mm | not listed | |
| Head tube length | 105mm | not listed | |
| Effective top tube | not listed | 618 | |
| Standover | not listed | 751 |
Differences are the Trek Session minus the Specialized Demo Expert. Full charts: 2023 Specialized Demo Expert, 2025 Trek Session.
Where each sits in its class
Specialized Demo ExpertTrek 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 | Specialized Demo ExpertExpert | Trek Session8 |
|---|---|---|
| Fork | RockShox BoXXer 29 | RockShox BoXXer |
| Rear shock | RockShox Super Deluxe Select | Marzocchi Bomber |
| Shifter | SRAM GX DH | not listed |
| Derailleur | SRAM GX DH | not listed |
| Cassette | SRAM GX DH | SRAM GX DH |
| Chain | SRAM PC1110 | SRAM PC 1110 |
| Crankset | Specialized DESCENDANT DH | TruVativ Descendant GX |
| Bottom bracket | SRAM DUB | not listed |
| Tire | Specialized Butcher | Bontrager G5 Team Issue, Bontrager G5 |
| Brake | SRAM Code RS | SRAM Code RSC |
| Stem | Specialized Descendant | Bontrager Line |
| Saddle | Specialized Henge DH | Bontrager Arvada |
| Frame | not listed | Trek Session 8 |
| Chainring | not listed | TruVativ 34 |
| Pedals | not listed | Wellgo BO-87B |
| Wheelset | not listed | Bontrager Line DH 30 |
| Handlebar | not listed | Bontrager Line |
| Seatpost | not listed | Bontrager Rhythm Elite |
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