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Performance Clutch & Flywheel Upgrade kit from OS Giken. A performance street & occasional track set-up good for 250 whp!
For the 2nd generation MINI Cooper S models including R56 Hardtop R55 Clubman R57 Convertible R58 Coupe R59 Roadster
OS Giken STR1CD Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2

OS Giken STR1CD Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2

OS Giken STR1CD Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2

OS Giken STR1CD Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2

OS Giken STR1CD Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2

OS Giken STR1CD Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2

OS Giken STR1CD Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2
Qty:
Specially Priced Item
$1525.99
Part No: G2NMG1640
Internet Price $1525.99
Alternate Products
OS Giken Grand Touring Soft Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2
$1690.99 OS Giken Grand Touring Soft Clutch Kit MINI Cooper S R55 R56 R57 R58 R59 Gen2
Mini Cooper S Clutch Kit Factory Original OEM Gen 2 R55 R56 R57 R58 R59 R60 R61
Mini Cooper S Clutch Kit Factory Original OEM Gen 2 R55 R56 R57 R58 R59 R60 R61
High Quality Performance STR1CD Clutch and Flywheel Upgrade kit from OS Giken for any 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.

Fits a 6-speed manual transmission on the following Cooper S models:

2007-2013 R56 MINI Cooper S Hardtop
2008-2014 R55 MINI Cooper S Clubman
2009-2015 R57 MINI Cooper S Convertible 
2012-2015 R58 MINI Cooper S Coupe
2012-2015 R59 MINI Cooper S Roadster

Also fits any JCW models.

Giken products costs slightly more than the factory dual mass flywheel and clutch replacements, but offers higher quality and durability. The integrated flywheel, clutch, and pressure plate design provides a 'matched' and 'balanced' solution.

Each Kit includes

  • Clutch Disc
  • Pressure Plate
  • Flywheel
  • A metal Throwout Bearing.

Click here for the G2NMG164 Grand Touring Kit.

This clutch AND flywheel kit only weighs 25.4 lbs! (The stock flywheel ALONE weighs 27.7 lbs.)

For a more 'street' oriented Clutch/Flywheel upgrade, see G2NMG1643 Grand Touring Kit.

NOTE: Use new OEM Flywheel Bolts (not included) - since the Giken Flywheel is 3mm THINNER than the stock flywheel, bolt length MUST BE CONFIRMED before assembly. It may be necessary to reduce bolt length by 3mm in order to prevent obstruction.

Discs
The STR1CD kit utilizes full face metallic clutch plates to achieve high torque capacity from our clutches. This allows use of much softer diaphragm springs to achieve equal or better torque capacity compared to our competitors with substantially less pedal effort.

Clutch Cover 
The specially designed clutch cover contains a unique leverage mechanism for the diaphragm spring, resulting in a higher clamping load of the clutch disc(s) while also reducing pedal effort. These diaphragm springs combined with the special OS Giken Release Sleeves provide a much easier to operate clutch.

Clutch Housing
Integrated ventilation holes reduce heat generated inside the clutch system and allows for friction plate dust to exit outside the clutch system, thus increasing reliability and safety. Both the clutch housing and flywheel are chemically heat treated to handle extreme conditions. Increased power output typically requires more torque capacity(friction) in order to hold. This often leads to more heat being generated

Flywheel
The hardened steel alloy flywheels provide superior durability and life than aluminum flywheels, which also results in quicker and predictable engine response. We develop our own flywheel design to maximize our design and engineering philosophies into a no-compromise, complete clutch assembly.

See G2NMG7603 for OEM Flywheel Bolts.

For the 2002-2006 R53 Cooper S Hatchback and 2005-2008 R52 Cooper S Convertibles, see NMG1630.

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

For the matching OS Giken Super Lock Limited Slip Differential, take a look at G2NMG1100.

THE OS GIKEN SOLUTION

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 'twin-mass' flywheel uses sprung plates to absorb gearbox vibrations. The Giken unit is a single mass unit which may increase gearbox 'noise'.

THE OS GIKEN ADVANTAGE

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.

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).

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

Manufacturer's Guarantee

  • All OS Giken goods are guaranteed to be in working order and free of manufacturing defects
  • All OS Giken products are intended for off-road use, no warranty is provided
  • No Returns on purchases over 90 days old
  • No Returns on items that have been installed on a vehicle or items that cannot be resold as new and unused
  • All Returns are subject to a 25% Restocking Fee (Valid Warranty Claims Excluded)
  • All returns are subject to approval by OS Giken USA Inc prior to acceptance

 

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