The facts.
| Brand | STM |
|---|---|
| Part number | FKT-S080 |
| Type | Slipper clutch (anti-hopping clutch) |
| Fitment | KTM RC8 1190 (2008-2011) |
| Anti-hopping mechanism | Patented ball-ramp system |
| Spring type | Diaphragm spring |
| Weight saving | Approximately 0.7-0.8 kg reduction in rotating mass |
DescriptionThe whole story▼
Engineered for riders who demand absolute confidence under hard braking and late down-shifts, the STM slipper clutch for the KTM RC8 1190 (2008-2011) transforms the way this V-twin behaves on the way into a corner. Part number FKT-S080 delivers smoother, more predictable clutch engagement all day long — whether you are lapping a circuit or pushing hard on a mountain road — so fatigue stays low and your focus stays on the next apex.
Key Features
- Prevents engine over-rev on down-shifts, keeping the rear wheel planted and the chassis composed through corner entry
- Minimises rear wheel hop under engine braking, adding measurable stability and traction when it matters most
- Reduces the trigger impulse of a highside, significantly lowering risk at high speeds and lean angles
- Enables controlled rear wheel slide for improved handling balance and more intuitive cornering feel
- Better management of clutch closing phase in bends prevents the front end from tucking under deceleration
- Diaphragm spring design eliminates pressure plate wobble, giving the lever a smoother, more consistent release feel that reduces hand fatigue over a long session
- Patented ball-ramp mechanism governs the anti-hopping function with precision and repeatability at high rpm
- Weight saving of approximately 0.7-0.8 kg through a reduction in rotating mass, sharpening throttle response and overall performance of the RC8 1190
Build Quality and Technology
STM's slipper clutch technology is trusted at the highest levels of circuit racing, and the FKT-S080 brings that same engineering rigour to the KTM RC8 1190. The patented ball-ramp system is the heart of the design: under normal acceleration the ramps lock the clutch basket solidly for full power transmission, but the moment the drivetrain reverses under aggressive down-shifts, the ramps progressively unload clutch pressure, allowing a controlled slip that absorbs the shock before it reaches the tyre. The diaphragm spring replaces the conventional coil-spring stack, removing pressure plate flutter and delivering a lever pull that feels linear and effortless — a genuine comfort advantage on long track days or spirited road rides where repeated down-shifts accumulate.
Performance on Track and Road
On track, the reduction in rotating mass translates directly into faster response from both engine and chassis — the RC8 1190 feels lighter on its feet and changes direction more willingly. On the road, the anti-hopping function removes the anxiety of a sudden rear wheel skip mid-corner, letting you focus on smooth, committed riding rather than managing unwanted drama from the drivetrain. The result is a clutch that actively makes you a more confident, more consistent rider every time you go out.
Fitment and Compatibility
This STM slipper clutch is a direct-fit replacement engineered specifically for the following motorcycle:
- KTM RC8 1190 — model years 2008, 2009, 2010, 2011
Specifications
- Brand: STM
- Part number: FKT-S080
- Type: Slipper clutch (anti-hopping clutch)
- Fitment: KTM RC8 1190 (2008-2011)
- Anti-hopping mechanism: Patented ball-ramp system
- Spring type: Diaphragm spring
- Weight saving: approximately 0.7-0.8 kg reduction in rotating mass
FitmentWhich bikes this fits▼
- KTM RC8 1190 (2008–2011)
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