Aprilia RS 660 STM Slipper Clutch

STM slipper clutches are designed for riders looking for a high quality and sophisticated clutch system for road and track use. Designed as a direct replacement to OEM parts, you can install them like for like with no modification.

The unique design utilises a primary and a secondary spring which allows the rider to specify how much drive grip and clutch slip they require, independently, when on and off the throttle. Of course the STM clutches are pre-supplied with a great pairing of springs, but for riders looking for a particular feel - anything is possible. Primary and secondary springs are available in our store in various kg/mm ratings.

STM are technical partners to HRC, Ducati, PTR Triumph, KTM and TM Racing. These technical partnerships allow the manufacturer to channel R&D into real world enhancements and improvements, which improve lap times.