2018 Specialized Stumpjumper Men's 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 Men's 27.5 in M, the Specialized Stumpjumper ST Alloy 27.5 in S places the top of the head tube 4 mm lower and 20 mm further back, relative to the bottom bracket. Its wheelbase is 22 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −4 mm
- Lower front end
- Frame reach
- −20 mm
- Shorter frame reach
- Wheelbase
- −22 mm
- Shorter: quicker to change direction
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Stumpjumper Men's 27.5, MSpecialized Stumpjumper ST Alloy 27.5, SDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Stumpjumper Men's 27.5 M | Specialized Stumpjumper ST Alloy 27.5 S | Difference |
|---|---|---|---|
| Reach | 435mm | 415mm | −20 mm |
| Stack | 596mm | 592mm | −4 mm |
| Head tube angle | 65.5° | 65.5° | ±0.0° |
| Seat tube angle | 75° | 75.3° | +0.3° |
| Effective top tube | 595mm | not listed | |
| Chainstay length | 432mm | 432mm | ±0 mm |
| Wheelbase | 1179mm | 1157mm | −22 mm |
| BB drop | 21mm | 21mm | ±0 mm |
| BB height | 336mm | 336mm | ±0 mm |
| Standover | 743mm | 752mm | +9 mm |
| Seat tube length | 410mm | 380mm | −30 mm |
| Fork length | 542mm | 542mm | ±0 mm |
| Head tube length | 110mm | 105mm | −5 mm |
Differences are the Specialized Stumpjumper ST Alloy 27.5 minus the Specialized Stumpjumper Men's 27.5. Full charts: 2018 Specialized Stumpjumper Men's 27.5, 2020 Specialized Stumpjumper ST Alloy 27.5.
Where each sits in its class
Specialized Stumpjumper Men's 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 Men's 27.5Men's S-Works 27.5 | Specialized Stumpjumper ST Alloy 27.5 |
|---|---|---|
| Fork | Fox Float 36 Factory | not listed |
| Rear shock | Fox Float DPX2 Factory | not listed |
| Shifter | SRAM XX1 Eagle | not listed |
| Derailleur | SRAM XX1 Eagle | not listed |
| Cassette | SRAM X01 Eagle | not listed |
| Chain | SRAM XX1 Eagle | not listed |
| Crankset | SRAM XX1 Eagle | not listed |
| Tire | Specialized Butcher, Specialized Purgatory | not listed |
| Hub | Roval Traverse | not listed |
| Rim | Roval Traverse SL 27.5 | not listed |
| Brake | SRAM Guide RSC | not listed |
| Stem | Syntace MegaForce 2 | not listed |
| Grips | Specialized Sip Grip | not listed |
| Seatpost | Specialized Command Post IRcc | not listed |
| Saddle | Specialized Phenom Expert | not listed |
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