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STM Slipper Clutch Yamaha YZF-R1/M RN32, RN49 & RN65 (2015-2026) FYA-S170

€1.028,05 €1.181,67

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Engineered from the ground up for the demands of track and high-performance road riding, the STM slipper clutch for the Yamaha YZF-R1/M (RN32, RN49 & RN65, 2015-2026) is a precision Italian component that fundamentally transforms clutch behaviour under hard braking and aggressive downshifts. Where the stock unit can allow the rear wheel to hop and the engine to over-rev on corner entry, the STM unit draws on patented ball-ramp technology and a diaphragm spring pressure plate to restore composure and put the rider firmly in control.

Key Features

  • Patented ball-ramp mechanism precisely governs the anti-hopping function, maintaining clutch engagement consistency at high rpm without the harshness associated with conventional ramp systems.
  • Diaphragm spring pressure plate eliminates pressure-plate wobble and delivers a smoother, more progressive feel as the clutch lever is released — a tangible improvement over the OEM setup.
  • Prevents rear-wheel hop on aggressive downshifts, substantially improving traction and stability on corner entry.
  • Reduces highsider trigger impulse at speed, adding a meaningful safety margin during late, hard braking.
  • Allows controlled rear-wheel slides, enabling the rider to exploit the YZF-R1/M's power with greater confidence in the sportier portion of the rev range.
  • Significant rotating mass reduction of approximately 0.7–0.8 kg over the stock clutch assembly, contributing to sharper engine response and faster revving.

Build Quality & Materials

STM is an Italian manufacturer with decades of motorsport heritage, supplying clutch systems to World Superbike and Moto2 teams. Every component in the FYA-S170 kit reflects that pedigree: close-tolerance machined aluminium basket and hub, hardened ramp surfaces, and springs rated for sustained track-day abuse. The construction is designed not merely to function, but to remain consistent lap after lap — something the OEM clutch cannot guarantee under repeated aggressive use.

On Track and On Road

For riders pushing their YZF-R1 or R1M hard at the circuit, the benefits are immediately apparent. The rear wheel no longer skips unpredictably under trail braking, the engine reacts cleanly to blipped downshifts, and the closing phase of the clutch in corners is far more manageable — preventing the front-end dive that can unsettle the chassis at the worst possible moment. On road, the same qualities translate to greater confidence in unexpected situations where rapid downshifting is unavoidable.

Fitment & Compatibility

The STM FYA-S170 is a direct fitment for the following Yamaha models:

  • Yamaha YZF-R1 RN32 (2015–2016)
  • Yamaha YZF-R1M RN32 (2015–2016)
  • Yamaha YZF-R1 RN49 (2017–2019)
  • Yamaha YZF-R1M RN49 (2017–2019)
  • Yamaha YZF-R1 RN65 (2020–2026)
  • Yamaha YZF-R1M RN65 (2020–2026)

Specifications

  • Brand: STM
  • Part number: FYA-S170
  • Type: Slipper clutch (anti-hopping clutch)
  • Fitment: Yamaha YZF-R1/M RN32, RN49 & RN65 (2015–2026)
  • Anti-hopping mechanism: Patented ball-ramp system
  • Pressure plate: Diaphragm spring design
  • Weight saving: approximately 0.7–0.8 kg versus OEM rotating assembly
  • Intended use: Track and high-performance road riding
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