The facts.
| Brand | STM |
|---|---|
| Part Number | FMW-S040 |
| Type | Slipper clutch (anti-hopping clutch) |
| Key Technology | Patented ball-ramp anti-hopping mechanism |
| Spring Type | Diaphragm spring |
| Weight Saving | Approx. 0.7–0.8 kg reduction in rotating mass |
| Fitment | MV Agusta F3 675 (2011–2026) |
| Intended Use | Road sport and track |
DescriptionThe whole story▼
Engineered to exacting standards from premium-grade materials, the STM slipper clutch for the MV Agusta F3 675 represents a genuine step forward in clutch technology — one built to handle the stresses of hard track riding while delivering a measurably safer, more controlled downshift every time.
Key Features
- Prevents engine over-rev during aggressive downshifting, maintaining a smooth, composed deceleration phase
- Reduces rear wheel hop under hard braking, translating directly into improved traction and stability
- Lowers the trigger impulse of a potential highside, a critical safety gain at elevated speeds
- Allows controlled rear wheel slide for superior cornering feel and confidence on track
- Improved clutch engagement in corners prevents the front end from tucking under closing throttle
- Diaphragm spring design eliminates pressure plate flutter, giving the rider a cleaner, more progressive feel at the clutch lever
- Patented ball-ramp mechanism governs the slipper function with precision across the full rev range
- Significant reduction of rotating mass — approximately 0.7–0.8 kg saved — for a direct improvement in throttle response and overall performance
Premium Construction
STM's reputation is built on precision engineering, and the FMW-S040 is a clear example of that commitment. The patented ball-ramp system that controls the anti-hopping function is manufactured to tight tolerances, ensuring consistent, repeatable behaviour whether the clutch is cold on a morning warm-up lap or at operating temperature deep into a race session. The diaphragm spring — a design choice that distinguishes STM units from conventional slipper clutches — actively prevents pressure plate wobble, giving riders a level of lever feel rarely found even on factory-prepared machines.
Performance & Handling Gains
The weight saving of approximately 0.7–0.8 kg in rotating mass is not merely a paper figure. On the MV Agusta F3 675, where the engine sits centrally and its rotational inertia influences chassis dynamics, shedding that mass from the clutch assembly noticeably sharpens throttle response and reduces the gyroscopic effect through direction changes. Combined with the slipper mechanism's ability to modulate rear wheel slip rather than simply cutting it, this clutch lets riders trail-brake deeper and carry greater corner-entry speed with real confidence.
Fitment & Compatibility
This STM slipper clutch is a direct replacement unit specifically developed for the MV Agusta F3 675 across all model years from 2011 through to 2026 (part number FMW-S040). No additional adapters or modifications are required for fitment to compatible machines.
- MV Agusta F3 675 (2011–2026)
Specifications
| Brand | STM |
|---|---|
| Part Number | FMW-S040 |
| Type | Slipper clutch (anti-hopping clutch) |
| Key Technology | Patented ball-ramp anti-hopping mechanism |
| Spring Type | Diaphragm spring |
| Weight Saving | Approx. 0.7–0.8 kg reduction in rotating mass |
| Fitment | MV Agusta F3 675 (2011–2026) |
| Intended Use | Road sport and track |
FitmentWhich bikes this fits▼
- MV Agusta F3 675 (2011–2026)
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