SLIPPER CLUTCHES (STM & YOYODYNE)

Slipper Clutches – STM & YOYODYNE for Sport & Race Bikes

Aggressive downshifting under hard braking is one of the most demanding moments in sport and track riding. Without a slipper clutch, the engine's back-torque can overwhelm the rear tire, causing a tank-slapper or a scary rear-wheel hop that breaks your corner entry flow. A slipper clutch — also called a back-torque limiter — prevents exactly that by partially disengaging the clutch pack when engine braking exceeds a set threshold.

HardRacing carries STM and YOYODYNE slipper clutch systems — two of the most respected brands in the aftermarket clutch space. Both are used extensively in professional racing and club competition worldwide, and both offer significant improvements in confidence and lap time for aggressive street and track riders.

STM vs. YOYODYNE

STM (Italian) slipper clutches are CNC-machined from billet aluminum with a dry or wet clutch design depending on application. They're known for precise engagement, excellent durability, and a beautiful finish. YOYODYNE (USA) offers a slightly different engineering approach with their own proprietary ramp-and-ball back-torque limiting mechanism, delivering smooth, predictable slip characteristics that many riders prefer for street use.

A slipper clutch is one of the most confidence-building upgrades for any sport rider who pushes hard on the brakes. Browse our catalog to find the right system for your bike.