2018 Specialized Enduro Pro 650b vs 2020 Specialized Stumpjumper ST Alloy 27.5
The XL is the Specialized Stumpjumper ST Alloy 27.5 size closest to your XL Specialized Enduro Pro 650b. 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 ST Alloy 27.5
Compared with the Specialized Enduro Pro 650b in XL, the Specialized Stumpjumper ST Alloy 27.5 in XL places the top of the head tube 15 mm higher and 9 mm further back, relative to the bottom bracket. Its wheelbase is 9 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +15 mm
- Higher front end
- Frame reach
- −9 mm
- Shorter frame reach
- Wheelbase
- −9 mm
- Shorter: quicker to change direction
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- −1 mm
- About the same
The two frames
We can't draw these frames yet. The Specialized Enduro Pro 650b numbers we have for size XL are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Specialized Enduro Pro 650b XL | Specialized Stumpjumper ST Alloy 27.5 XL | Difference |
|---|---|---|---|
| Reach | 489mm | 480mm | −9 mm |
| Stack | 622mm | 637mm | +15 mm |
| Head tube angle | 65mm | 65.5° | +0.5° |
| Seat tube angle | not listed | 74.2° | |
| Effective top tube | 639mm | not listed | |
| Chainstay length | 433mm | 432mm | −1 mm |
| Wheelbase | 1252mm | 1243mm | −9 mm |
| BB drop | 5mm | 21mm | +16 mm |
| BB height | not listed | 336mm | |
| Standover | 786mm | 770mm | −16 mm |
| Seat tube length | 521mm | 505mm | −16 mm |
| Fork length | 564mm | 542mm | −22 mm |
| Head tube length | 130mm | 155mm | +25 mm |
Differences are the Specialized Stumpjumper ST Alloy 27.5 minus the Specialized Enduro Pro 650b. Full charts: 2018 Specialized Enduro Pro 650b, 2020 Specialized Stumpjumper ST Alloy 27.5.
Where each sits in its class
Specialized Enduro Pro 650bSpecialized 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 Enduro Pro 650bPro 650b | Specialized Stumpjumper ST Alloy 27.5 |
|---|---|---|
| Frame | Specialized FACT IS-X | not listed |
| Fork | Öhlins RXF 36 27.5 | not listed |
| Rear shock | Öhlins STX | not listed |
| Shifter | SRAM X01 Eagle | not listed |
| Derailleur | SRAM X01 Eagle | not listed |
| Cassette | SRAM X01 Eagle | not listed |
| Chain | SRAM X01 Eagle | not listed |
| Crankset | TruVativ Descendant | not listed |
| Bottom bracket | SRAM XR 73 | not listed |
| Tire | Specialized Butcher | not listed |
| Hub | DT Swiss 350 | not listed |
| Rim | Roval Traverse | not listed |
| Brake | SRAM Code R | not listed |
| Grips | Specialized Sip Grip | not listed |
| Seatpost | Specialized Command Post IRcc WU | not listed |
| Saddle | Specialized Henge Comp | not listed |
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