The facts.
| Brand | STM |
|---|---|
| Part number | FBM-S020 |
| Type | Slipper clutch (anti-hopping clutch) |
| Fitment | BMW S1000RR K46 (2009–2018) |
| Key mechanism | Patented ball-ramp anti-hopping system |
| Spring type | Diaphragm spring |
| Weight saving | Approx. 0.7–0.8 kg vs. OEM assembly |
DescriptionThe whole story▼
When lap times matter and every corner entry is a commitment, the STM slipper clutch for the BMW S1000RR K46 (2009-2018) delivers the mechanical confidence to brake later, downshift harder, and carry more corner speed. Engineered for track and sport riding, part number FBM-S020 eliminates rear-wheel hop and reduces the risk of a highside with a precision that no standard OEM clutch can match.
Key Features
- Prevents engine over-rev on aggressive downshifts, maintaining stable power delivery across all riding modes
- Eliminates rear-wheel chatter for precise traction and control under both acceleration and hard braking
- Reduces the trigger impulse of a highside, adding a critical safety margin at track speeds
- Enables controlled rear-wheel slides for confident, sport-oriented riding
- Superior clutch engagement feel through corners — prevents the front end from tucking as the clutch closes
- Diaphragm spring design prevents pressure plate wobble, resulting in a smoother, more progressive lever release
- Significant rotating mass reduction of approximately 0.7–0.8 kg, directly improving throttle response and handling agility
- Patented ball-ramp mechanism governs the anti-hopping function with pin-sharp accuracy at high engine speeds
Patented Ball-Ramp Technology
At the heart of the STM FBM-S020 sits a patented ball-ramp assembly — the defining element that separates this clutch from simpler slipper designs. Under hard deceleration the ramps separate the clutch plates progressively, metering the degree of engine braking in real time rather than applying a blunt, fixed reduction. The result is a rear tyre that stays planted and steerable rather than locking and skipping, giving the rider meaningful feedback and genuine control through the braking zone.
Weight and Rotating Mass
Shedding approximately 0.7–0.8 kg from the drivetrain's rotating assembly has a disproportionate effect on a high-revving inline-four. The S1000RR responds to throttle inputs more sharply, direction changes feel lighter, and the engine climbs through its rev range with noticeably less mechanical inertia. On circuit, that translates to faster lap times; on road, it means a more alert, involving riding experience.
Build Quality and Engineering
STM manufactures slipper clutches to the standards demanded by professional road-racing teams across Europe. Every component in the FBM-S020 is precision-machined to tight tolerances, ensuring consistent clutch behaviour from the first session to the hundredth. The diaphragm spring eliminates the pressure-plate float that can introduce inconsistency into the clutch feel, so the lever response remains predictable whether the engine is cold or fully up to temperature.
Fitment and Compatibility
The STM FBM-S020 is a direct fitment for the following motorcycle:
- BMW S1000RR — K46 chassis, model years 2009 to 2018
Specifications
| Attribute | Detail |
|---|---|
| Brand | STM |
| Part number | FBM-S020 |
| Type | Slipper clutch (anti-hopping clutch) |
| Fitment | BMW S1000RR K46 (2009–2018) |
| Key mechanism | Patented ball-ramp anti-hopping system |
| Spring type | Diaphragm spring |
| Weight saving | Approx. 0.7–0.8 kg vs. OEM assembly |
FitmentWhich bikes this fits▼
- BMW S1000RR K46 (2009–2018)
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