Competition twin-plate clutches

Featuring a higher clamping load than our STR series, the competition twin-plate clutches below are designed specifically for racing applications including drag racing. Power handling capacity varies according to the specific model. As a general guide A-size clutches are recommended for up to 430hp, B-size for up to 480hp and C-size for up to 600hp, however power handling will vary up or down depending on the torque characteristics of your engine. Please contact us to check if these clutches will suit your application.

Each clutch comes with a lightweight chrome-moly flywheel and the required bearing/carrier set or pull-push converter kit is included where required.

RACING PERFORMANCE by OS Giken
Through the research and development of high performance engines, OS Giken realized that the production of durable, higher quality clutch systems is essential. OS multi plate clutches can transmit increased engine revs and torque output to the drivetrain without loss. The research and development has been continued since the first introduction the OS Giken clutch series in 1983. They are made from the highest quality materials, with durability that is second to none. The extensive model line up is sure to meet your needs and produce the best result for your engine.

Distinctive Features of OS Giken Multi Plate Clutches
Despite using smaller plate diameter, OS Giken clutches achieve efficient power transmission, along with better engine response. Revising the factory leverage mechanism of the diaphragm spring provides higher pressure on the clutch discs while reducing pedal effort. Ventilation holes are designed to reduce heat generated inside the clutch housing. These holes also let friction plate dust out of the clutch system, increasing reliability and safety. The OS Racing Clutch friction plates are made of heat-treated metal. These materials are carefully selected and alloyed so that the plates match with the flywheel and center plate material to improve durability.