2018 Specialized Stumpjumper 27.5 Frameset vs 2020 Specialized Fuse M4
The XS is the Specialized Fuse M4 size closest to your S Specialized Stumpjumper 27.5 Frameset. 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 Fuse M4
Compared with the Specialized Stumpjumper 27.5 Frameset in S, the Specialized Fuse M4 in XS places the top of the head tube 35 mm higher and 12 mm further forward, relative to the bottom bracket. Its wheelbase is 26 mm longer, which can contribute to stability at speed.
- Frame stack
- +35 mm
- Higher front end
- Frame reach
- +12 mm
- Longer frame reach
- Wheelbase
- +26 mm
- Longer: steadier at speed
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Specialized Stumpjumper 27.5 Frameset is drawn. The Specialized Fuse M4 numbers we have for size XS are missing the chainstay length.
Geometry side by side
| Measurement | Specialized Stumpjumper 27.5 Frameset S | Specialized Fuse M4 XS | Difference |
|---|---|---|---|
| Reach | 388mm | 400mm | +12 mm |
| Stack | 590mm | 625mm | +35 mm |
| Head tube angle | 67° | 66.5° | −0.5° |
| Seat tube angle | 74° | 74° | ±0.0° |
| Effective top tube | 558mm | not listed | |
| Chainstay length | 420mm | not listed | |
| Wheelbase | 1096mm | 1122mm | +26 mm |
| BB drop | 18mm | not listed | |
| Standover | 742mm | 727mm | −15 mm |
| Seat tube length | 396mm | 340mm | −56 mm |
| Fork length | 542mm | 540mm | −2 mm |
| Head tube length | 105mm | 95mm | −10 mm |
Differences are the Specialized Fuse M4 minus the Specialized Stumpjumper 27.5 Frameset. Full charts: 2018 Specialized Stumpjumper 27.5 Frameset, 2020 Specialized Fuse M4.
Where each sits in its class
Specialized Stumpjumper 27.5 FramesetSpecialized Fuse M4
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 27.5 FramesetS-Works Frameset | Specialized Fuse M4 |
|---|---|---|
| Rear shock | Öhlins STX | not listed |
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