The R Clutch series line-up is our highest capacity clutch and is specifically designed for vehicles with a significant increase in engine power. Our unique floating center hub design is built to withstand transmission shock and abuse from high-powered racecars.
The R4C Clutch is specifically designed for vehicles with a significant increase in engine power and torque. It is capable of handling up to 1200lbs ft of torque and immense amounts of heat. This clutch is often found in our competition drift and drag vehicles as well as Dakar Rally type vehicles. Our unique floating dampened center hub design is built to withstand transmission shock and abuse from high-powered racecars.
Please consult installation guide
Overhaul Kits are meant for the repair and refurbishment of an OS Giken clutch kit. Overhaul kits are not universal fitment and must be specifically order for each particular model of OS Giken clutch.
Overhaul Kit A - Includes the follow parts:
Overhaul Kit B - Includes the follow parts:
The “Pre-Order” order option is enabled when the listed item is either temporarily out of stock, or is only available as a “built to order” item from our factory.
Once an order for a “Pre-Order” item is received, we will confirm lead-time with our Japan factory and contact you within 1-2 business days via email with current projected production lead-time information and delivery date projections. After accepted/authorized we will proceed with finalizing your order. If the quoted lead-time is not accepted, the order will be promptly cancelled and you will be refunded immediately in full.
If there is further delay after your placed order, we will contact you with an updated delivery lead-time or provide you with the option to cancel with a full refund for any unfulfilled order items.
While there is no risk in ordering “Pre-Order” items through our website, feel free to contact us ahead of time regarding product leadtime.