2026 Specialized Stumpjumper 15 Pro vs 2026 Forbidden Heathen Framekit
The Forbidden Heathen Framekit size closest to your S3 is the S2. Compare the S2 instead
What changes on the Forbidden Heathen Framekit
Compared with the Specialized Stumpjumper 15 Pro in S3, the Forbidden Heathen Framekit in S4 places the top of the head tube 18 mm higher and 50 mm further forward, relative to the bottom bracket. Its wheelbase is 54 mm longer, which can contribute to stability at speed.
- Frame stack
- +18 mm
- Higher front end
- Frame reach
- +50 mm
- Longer frame reach
- Wheelbase
- +54 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Specialized Stumpjumper 15 Pro is drawn. The Forbidden Heathen Framekit numbers we have for size S4 are missing the chainstay length.
Geometry side by side
| Measurement | Specialized Stumpjumper 15 Pro S3 | Forbidden Heathen Framekit S4 | Difference |
|---|---|---|---|
| Reach | 445 | 495 | +50 mm |
| Stack | 630 | 648 | +18 mm |
| Head tube angle | 64 | 64 | ±0.0° |
| Seat tube angle | 76.5 | 76 | −0.5° |
| Effective top tube | 596 | 657 | +61 mm |
| Chainstay length | 435 | not listed | |
| Wheelbase | 1217 | 1270.6 | +54 mm |
| BB drop | 35 | not listed | |
| BB height | 340 | 311 | −29 mm |
| Standover | 745 | 764 | +19 mm |
| Seat tube length | 405 | 470 | +65 mm |
| Head tube length | 110 | 120 | +10 mm |
| Fork length | not listed | 541 |
Differences are the Forbidden Heathen Framekit minus the Specialized Stumpjumper 15 Pro. Full charts: 2026 Specialized Stumpjumper 15 Pro, 2026 Forbidden Heathen Framekit.
Where each sits in its class
Specialized Stumpjumper 15 ProForbidden Heathen Framekit
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 15 ProPro | Forbidden Heathen Framekit |
|---|---|---|
| Frame | Specialized Stumpjumper 15 | not listed |
| Fork | Fox 36 Factory | not listed |
| Rear shock | Fox Float X Factory | not listed |
| Shifter | SRAM AXS POD Rocker | not listed |
| Derailleur | SRAM X0 Eagle Transmission | not listed |
| Cassette | SRAM 1295 X01 | not listed |
| Crankset | SRAM X0 Eagle Transmission | not listed |
| Chainring | SRAM 32 | not listed |
| Bottom bracket | SRAM DUB GX | not listed |
| Wheelset | Roval Traverse SL II | not listed |
| Tire | Specialized Butcher, Specialized Eliminator | not listed |
| Brake | SRAM Maven Silver Stealth | not listed |
| Rotor | SRAM CenterLine | not listed |
| Handlebar | Deity Speedway | not listed |
| Dropper post | BikeYoke Revive Max 3.0 | not listed |
| Saddle | Specialized Bridge Expert | not listed |
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