2020 Specialized Stumpjumper ST Alloy 27.5 vs 2020 Specialized Stumpjumper 27.5
The S is the Specialized Stumpjumper 27.5 size closest to your S Specialized Stumpjumper ST Alloy 27.5. 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 Stumpjumper 27.5
Compared with the Specialized Stumpjumper ST Alloy 27.5 in S, the Specialized Stumpjumper 27.5 in S places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- ±0 mm
- About the same
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Stumpjumper ST Alloy 27.5, SSpecialized Stumpjumper 27.5, SDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Stumpjumper ST Alloy 27.5 S | Specialized Stumpjumper 27.5 S | Difference |
|---|---|---|---|
| Reach | 415mm | 415mm | ±0 mm |
| Stack | 592mm | 592mm | ±0 mm |
| Head tube angle | 65.5° | 65.5° | ±0.0° |
| Seat tube angle | 75.3° | 75.3° | ±0.0° |
| Chainstay length | 432mm | 432mm | ±0 mm |
| Wheelbase | 1157mm | 1157mm | ±0 mm |
| BB drop | 21mm | 21mm | ±0 mm |
| BB height | 336mm | 336mm | ±0 mm |
| Standover | 752mm | 739mm | −13 mm |
| Seat tube length | 380mm | 380mm | ±0 mm |
| Fork length | 542mm | 542mm | ±0 mm |
| Head tube length | 105mm | 105mm | ±0 mm |
Differences are the Specialized Stumpjumper 27.5 minus the Specialized Stumpjumper ST Alloy 27.5. Full charts: 2020 Specialized Stumpjumper ST Alloy 27.5, 2020 Specialized Stumpjumper 27.5.
Where each sits in its class
Specialized Stumpjumper ST Alloy 27.5Specialized Stumpjumper 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 ST Alloy 27.5 | Specialized Stumpjumper 27.5S-Works 27.5 |
|---|---|---|
| Fork | not listed | Fox FLOAT Rhythm |
| Rear shock | not listed | Fox FLOAT DPX2 Factory |
| Shifter | not listed | Shimano XTR M9100 |
| Derailleur | not listed | Shimano XTR M9100 |
| Cassette | not listed | Shimano XTR M9100 |
| Chain | not listed | Shimano XTR M9100 |
| Crankset | not listed | Race Face Next |
| Wheelset | not listed | Roval Traverse SL |
| Tire | not listed | Specialized Butcher, Specialized Eliminator |
| Brake | not listed | Shimano XTR M9120 |
| Stem | not listed | Specialized Deity |
| Grips | not listed | Specialized Deity |
| Seatpost | not listed | Fox Transfer |
| Saddle | not listed | Specialized Myth 155 |
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