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OS Giken Clutch/Flywheel - R53/R56/55/57 MINI Cooper S

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Product Description

Untitled DocumentOS Giken STR Clutch/Flywheel Uupgrade - R53/R56/55/57 COOPER S

High Quality Performance Clutch and Flywheel Upgrade kit from OS Giken for your MINI. A performance street / occasional track set-up good for MINIs with up to 300-350 whp, yet delivers with 'stock-like' pedal pressure perfect for daily driving. Works great on the track for 250 whp MINIs. Choose between the STR version for a stiffer pedal feel or the GT version for a more stock (softer) pedal feel

Giken products are not for the 'frugal', but for those that seek a performance solution with priority in quality and durability. The integrated flywheel, clutch, and pressure plate design maximizes performance in a tightly packaged 'matched' and 'balanced' solution.

Select STR or GT from the pull-down menu.

Fits 6-speed Manual Transmission equipped 2002-2006 R53, 2007+ R56 MINI Cooper S Hatchback, R55 Cooper S Clubman, and R57 Cooper S Convertible.


Kit includes Clutch Disc, Pressure Plate, Flywheel, Flywheel Bolts and a metal Throwout Bearing.


The STR series single plate clutches were designed for daily driven high performance vehicles. STR clutches provide the comfort of the stock clutch’s pedal feel and the strength of a race ready setup. Whether it be a lap around the track or a trip to the corner store, the STR clutch equally handles each task with ease.

NOTE: The stock 'dual-mass' flywheel uses gel sprung plates to absorb gearbox vibrations. The Giken unit is a single mass unit which may increase slight gearbox 'noise'.

OS Giken Clutches: Through our research and development of high performance engines, we realized the need for the production of higher quality, more durable clutch systems to meet the rigorous demands of race and sport driving. Our OS clutch is able to transmit engine revolutions and output to the drive train without loss. They are made of the highest quality materials and their durability is second to none. Our continual research and development has brought about many improvements and we are confident that our clutches can meet the demands of even the most heavily modified vehicles.


Flywheel and Clutch Weight: Stock dual mass flywheel and stock clutch 40lbs. OS Giken flywheel and clutch 23.5lbs


What is the difference between an OS Giken clutch and another companies clutch?
Through years of development and since its first introduction to the public in 1983, OS Giken clutches have always focused on extraordinary durability, drivability, and effective power transmission. In order to properly develop a clutch system to maximize drivetrain performance, OS Giken determined that it would be most effective to engineer and manufacture clutch kits as a clutch/flywheel package. By doing so, a clutch kit can be installed which has already been properly matched to your MINI. Additionally, the design, engineering and manufacturing of OS Giken clutch kits promote improved durability (through friction plate material which is carefully selected and alloyed so that the plates match with the materials of the flywheel and center plate), maintained drivability (through revised leverage mechanisms to provide higher disk pressure while reducing pedal effort), increased longevity (through a superior design and usage of extra manufacturing processes for strengthening).

OS Giken has a nice write up on their frequently asked questions. Read OS Giken's FAQ's.

In 1975, OS Giken made it's memorable entry into the racing world with the its unparalleled Four Valve DOHC TC16-MAII/TC24-B1 engine and firmly established itself as one Japan's most innovative race engineering companies.

Because all of OS Giken's designs and concepts are based on sound engineering and quality manufacturing, their reputation for reliable performance and durability is unparalleled.

Consequently, OS Giken’s drive train products are commonly the first choice for professional race teams in Japan, because in order to finish first you must first finish the race.

When the time comes, an 'overhaul' kit is available.

Note: Depending on inventory, this product may need to be supplied from the manufacturer overseas. Delivery 'may' take 4 weeks.

Installation Torque Specifications:

Cover bolts: 13 lb-ft

Housing bolts (attached to back side of flywheel): 13 lb-ft

Diaphragm spring bolts: DO NOT TIGHTEN OR LOOSEN

Flywheel bolts: 22 lb-ft plus 90º

OS Giken Clutch/Flywheel - R53/R56/55/57 MINI Cooper S

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