⟲ 360° — drag meThe facts.
| Brand | STM |
|---|---|
| Part number | FQJ-S800 |
| Type | Slipper clutch (anti-hopping wet clutch) |
| Fitment | QJ Motor SKR 800 RR (2024–2026) |
| Clutch system | Wet clutch |
| Installation | Direct plug-and-play replacement |
| Intended use | Road and track |
DescriptionThe whole story▼
Engineered from the ground up for the QJ Motor SKR 800 RR, the STM FQJ-S800 slipper clutch is a precision-machined wet clutch assembly built to the exacting standards that have made STM the benchmark for performance clutch technology in European motorsport. Where the standard clutch leaves room for improvement under hard deceleration, the FQJ-S800 steps in with genuine anti-hopping technology, eliminating rear-wheel chatter and transforming the SKR 800 RR's behaviour in demanding riding conditions.
Key Features
- Optimised anti-hopping mechanism dramatically reduces rear-wheel hop under aggressive downshifts and late braking
- Wet clutch design delivers superior thermal resistance, maintaining consistent performance across extended, demanding riding sessions
- Smoother, more progressive gear changes — particularly noticeable when shifting down quickly into tight corners
- Improved cornering stability and confidence at high lean angles, where precise drivetrain management matters most
- Direct-fit plug-and-play installation engineered specifically for the SKR 800 RR — no modification required
- Premium STM construction: close-tolerance components manufactured to racing-grade quality standards
Build Quality and Premium Materials
STM has built its reputation on producing clutch components that go straight from the racetrack to the road without compromise. The FQJ-S800 reflects this heritage in every detail: the basket, hub, and pressure plate are machined from high-grade materials selected for durability and dimensional stability under repeated thermal cycling. The wet clutch architecture keeps operating temperatures in check far more effectively than a dry system, meaning the clutch plate stack maintains its friction characteristics whether you're on a spirited mountain road or pushing hard at a track day. The result is a clutch that feels consistent, precise, and completely confidence-inspiring lap after lap or mile after mile.
Performance on Road and Track
The SKR 800 RR is a genuinely capable middleweight, and the FQJ-S800 allows the rider to exploit that capability more fully. During aggressive downshifts the anti-hopping ramp geometry allows the clutch to slip momentarily, decoupling the engine from the rear wheel just enough to prevent the destructive locking forces that cause chassis instability. The rider experiences this as a composed, settled rear end rather than a snatching, unsettled one — freeing them to brake deeper, turn in later, and carry more corner speed. For daily riders who want cleaner, less jarring downshifts, the benefit is equally tangible in urban and touring conditions.
Who This Upgrade Is For
- Riders who push the SKR 800 RR hard on road or track and want maximum rear-end stability
- Those who demand precise, predictable drivetrain behaviour when shifting down quickly
- Owners looking for a high-quality performance upgrade that is genuinely purpose-built for this model
- Anyone who wants greater safety margins and more feedback-rich riding dynamics from their SKR 800 RR
Fitment & Compatibility
- QJ Motor SKR 800 RR — model years 2024, 2025, 2026
Specifications
- Brand: STM
- Part number: FQJ-S800
- Type: Slipper clutch (anti-hopping wet clutch)
- Fitment: QJ Motor SKR 800 RR (2024–2026)
- Installation: Direct plug-and-play replacement
- Clutch system: Wet clutch
FitmentWhich bikes this fits▼
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