2020 Specialized Stumpjumper Expert Carbon 27.5 vs 2020 Specialized Stumpjumper ST Alloy 27.5
The Specialized Stumpjumper ST Alloy 27.5 size closest to your M is the M. Compare the M instead
What changes on the Specialized Stumpjumper ST Alloy 27.5
Compared with the Specialized Stumpjumper Expert Carbon 27.5 in M, the Specialized Stumpjumper ST Alloy 27.5 in XS places the top of the head tube 15 mm lower and 30 mm further back, relative to the bottom bracket. Its wheelbase is 52 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −15 mm
- Lower front end
- Frame reach
- −30 mm
- Shorter frame reach
- Wheelbase
- −52 mm
- Shorter: quicker to change direction
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Stumpjumper Expert Carbon 27.5, MSpecialized Stumpjumper ST Alloy 27.5, XSDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Stumpjumper Expert Carbon 27.5 M | Specialized Stumpjumper ST Alloy 27.5 XS | Difference |
|---|---|---|---|
| Reach | 435mm | 405mm | −30 mm |
| Stack | 596mm | 581mm | −15 mm |
| Head tube angle | 65.5° | 66.5° | +1.0° |
| Seat tube angle | 75° | 76.5° | +1.5° |
| Chainstay length | 432mm | 432mm | ±0 mm |
| Wheelbase | 1179mm | 1127mm | −52 mm |
| BB drop | 21mm | 28mm | +7 mm |
| BB height | 336mm | 325mm | −11 mm |
| Standover | 743mm | 742mm | −1 mm |
| Seat tube length | 410mm | 380mm | −30 mm |
| Fork length | 542mm | 522mm | −20 mm |
| Head tube length | 110mm | 100mm | −10 mm |
Differences are the Specialized Stumpjumper ST Alloy 27.5 minus the Specialized Stumpjumper Expert Carbon 27.5. Full charts: 2020 Specialized Stumpjumper Expert Carbon 27.5, 2020 Specialized Stumpjumper ST Alloy 27.5.
Where each sits in its class
Specialized Stumpjumper Expert Carbon 27.5Specialized Stumpjumper ST Alloy 27.5
Each bike is ranked against the other trail 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 Stumpjumper Expert Carbon 27.5Expert Carbon 27.5 | Specialized Stumpjumper ST Alloy 27.5 |
|---|---|---|
| Fork | Fox FLOAT Rhythm | not listed |
| Rear shock | Fox Float DPX2 Performance | not listed |
| Shifter | SRAM GX Eagle | not listed |
| Derailleur | SRAM GX Eagle | not listed |
| Cassette | SRAM GX Eagle | not listed |
| Chain | SRAM GX Eagle | not listed |
| Crankset | SRAM Descendant | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Pedals | Specialized PROVIDED BY | not listed |
| Tire | Specialized Butcher, Specialized Eliminator | not listed |
| Hub | DT Swiss 370 | not listed |
| Rim | Roval Traverse | not listed |
| Brake | SRAM Code | not listed |
| Grips | Specialized Deity | not listed |
| Seatpost | X-Fusion Manic | not listed |
| Saddle | Specialized Bridge 155 S2 | not listed |
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