STM Slipper Clutch Honda CBR 600 RR (2022-2025) FHN-S190

Engineered from the ground up for precision and durability, the STM slipper clutch for the Honda CBR 600 RR (2022-2025) is a race-proven upgrade that transforms how this supersport machine behaves under hard braking and aggressive downshifts. Where the stock clutch struggles at the limit, STM's patented ball-ramp mechanism and diaphragm spring technology deliver the kind of composed, predictable feel that separates controlled riding from chaos.

Key Features

• Patented ball-ramp mechanism governs the slipper function with exceptional precision, optimising clutch engagement at high engine speeds for maximum riding control
• Diaphragm spring eliminates pressure plate flutter during clutch release, giving the lever a smoother, more consistent feel lap after lap
• Prevents engine over-rev on downshifts, keeping the drivetrain stable and reducing the risk of a highsider under trail braking
• Minimises rear wheel hop during aggressive deceleration, improving traction and allowing controlled rear wheel slides for track-focused riding
• Improved clutch closure phase in corners prevents the front end from tucking, adding a meaningful layer of safety in fast direction changes
• Significant reduction in rotating mass — approximately 0.7 to 0.8 kg lighter than the OEM assembly — freeing up power and sharpening throttle response

Build Quality and Premium Materials

STM is one of the most respected names in aftermarket clutch technology, and the FHN-S190 reflects that reputation fully. Every component in this assembly is manufactured to the tight tolerances demanded by professional racing, using high-grade alloys and surface treatments chosen for longevity under sustained heat and stress. The ball-ramp geometry is a patented STM design that has been refined over years of development at the highest levels of motorcycle competition. The result is a clutch that not only performs at the track but holds up season after season without the degradation you would expect from lesser alternatives.

The diaphragm spring is a particularly notable detail. Rather than relying on conventional coil springs, this layout prevents the pressure plate from wobbling during disengagement — a subtle but tangible improvement in lever feel that experienced riders will notice immediately. Combined with the precision-machined basket and hub, every shift feels deliberate and mechanical in the very best sense.

Performance on Track and Road

For Honda CBR 600 RR riders who push their machines hard, the factory clutch presents well-known limitations under sustained track use: rear wheel chatter on the brakes, inconsistent lever feedback mid-corner, and the ever-present risk of a highsider when engine braking overwhelms traction. The STM FHN-S190 addresses each of these issues systematically. The slipper function bleeds off excess engine braking torque smoothly, keeping the rear tyre loaded and compliant rather than skipping across the tarmac. The weight saving of approximately 0.7 to 0.8 kg from reduced rotating mass sharpens the CBR's already eager character, translating to crisper acceleration out of slow corners and a more responsive feel through the rev range.

Fitment and Compatibility

This clutch is specifically designed and validated for the following model:

• Honda CBR 600 RR — model years 2022, 2023, 2024, 2025

Specifications

• Brand: STM
• Part number: FHN-S190
• Type: Slipper clutch (anti-hopping clutch)
• Fitment: Honda CBR 600 RR (2022-2025)
• Slipper mechanism: Patented ball-ramp system
• Spring type: Diaphragm spring
• Weight saving vs. OEM: approx. 0.7-0.8 kg (reduction in rotating mass)