2022 Specialized Fuse M4 vs 2020 Specialized Stumpjumper ST Alloy 29
The M is the Specialized Stumpjumper ST Alloy 29 size closest to your M Specialized Fuse M4. 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 29
Compared with the Specialized Fuse M4 in M, the Specialized Stumpjumper ST Alloy 29 in M places the top of the head tube 6 mm lower and 15 mm further back, relative to the bottom bracket. Its wheelbase is 9 mm longer, which can contribute to stability at speed.
- Frame stack
- −6 mm
- Lower front end
- Frame reach
- −15 mm
- Shorter frame reach
- Wheelbase
- +9 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- +2 mm
- About the same
The two frames
Specialized Fuse M4, MSpecialized Stumpjumper ST Alloy 29, MDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Fuse M4 M | Specialized Stumpjumper ST Alloy 29 M | Difference |
|---|---|---|---|
| Reach | 440mm | 425mm | −15 mm |
| Stack | 625mm | 619mm | −6 mm |
| Head tube angle | 66.5° | 66.5° | ±0.0° |
| Seat tube angle | 74° | 74.5° | +0.5° |
| Chainstay length | 435mm | 437mm | +2 mm |
| Wheelbase | 1162mm | 1171mm | +9 mm |
| Standover | 750mm | 762mm | +12 mm |
| Seat tube length | 410mm | 410mm | ±0 mm |
| Fork length | 540mm | 560mm | +20 mm |
| Head tube length | 110mm | 100mm | −10 mm |
| BB drop | not listed | 33mm | |
| BB height | not listed | 341mm |
Differences are the Specialized Stumpjumper ST Alloy 29 minus the Specialized Fuse M4. Full charts: 2022 Specialized Fuse M4, 2020 Specialized Stumpjumper ST Alloy 29.
Where each sits in its class
Specialized Fuse M4Specialized Stumpjumper ST Alloy 29
Each bike is ranked against the other trail bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
