The facts.
| Brand | STM |
|---|---|
| Part number | FCF-S010 |
| Type | Slipper clutch (anti-hopping clutch) |
| Fitment | CFMOTO 450 SR (2024–2026) |
| Anti-hopping mechanism | Patented ball-ramp system |
| Release mechanism | Diaphragm spring |
| Rotating mass saving | approx. 0.7–0.8 kg vs. standard clutch |
DescriptionThe whole story▼
Whether you're commuting hard through traffic or pushing the CFMOTO 450 SR on a weekend track day, the STM slipper clutch FCF-S010 transforms the way the bike responds under aggressive downshifts — delivering smoother, more predictable behaviour that benefits everyday riding just as much as circuit work.
Key Features
- Eliminates unwanted engine over-rev on downshifts, keeping throttle response linear and behaviour predictable at all speeds
- Reduces rear wheel hop under trail-braking, improving traction and overall stability in corners
- Lowers the risk of a highside by decoupling sudden rear-wheel lock impulses from the drivetrain
- Permits controlled rear wheel slides, giving confident, sport-oriented riders the latitude to use the rear end actively
- Improves control over clutch engagement during corner entry, preventing unwanted chassis squat mid-bend
- Diaphragm spring design ensures smooth, consistent clutch release and eliminates pressure-plate wobble
- Saves approximately 0.7–0.8 kg of rotating mass compared to the stock assembly, benefiting acceleration and engine response
- Patented ball-ramp mechanism provides precise, repeatable control of the slipper function even at high engine speeds
Real-World Usability
The FCF-S010 is not purely a track tool. Because the anti-hopping function smooths out the drivetrain jolt that occurs every time you change down in traffic or on B-roads, daily riding becomes noticeably less fatiguing. The bike hooks up cleanly on corner exit rather than hunting for grip, and the lighter rotating assembly sharpens throttle response from lower revs — a combination that makes the CFMOTO 450 SR feel genuinely more refined without requiring any changes to riding style.
Technology & Construction
STM's slipper clutch design centres on a patented ball-ramp system that automatically modulates clamping force during engine braking. As the rear wheel tries to overrun the engine, the ramps partially disengage the clutch plates, absorbing the excess energy. Once the engine and wheel speeds re-balance, full clamping force is restored instantly. The diaphragm spring replaces the conventional coil-spring stack, providing a more progressive lever feel and eliminating the inconsistent release behaviour associated with worn coil springs. The reduction in rotating mass — 0.7–0.8 kg — comes from STM's lightweight billet construction, which also contributes to the component's durability.
Fitment & Compatibility
The STM FCF-S010 is a direct-fit slipper clutch designed specifically for the CFMOTO 450 SR covering model years 2024, 2025, and 2026. No modification to the engine cases or clutch basket is required for installation.
Specifications
- Brand: STM
- Part number: FCF-S010
- Type: Slipper clutch (anti-hopping clutch)
- Fitment: CFMOTO 450 SR (2024–2026)
- Anti-hopping mechanism: Patented ball-ramp system
- Release mechanism: Diaphragm spring
- Rotating mass saving: approx. 0.7–0.8 kg vs. standard clutch
FitmentWhich bikes this fits▼
- CFMOTO 450 SR (2024–2026)
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