Lightweight all steel billet flywheel, for use with SB53X-2 clutch kits

SPEC Flywheels are CNC manufactured at an unheard-of .001 tolerance, in an industry where the standard is .010. This precision manufacturing process ensures perfect balance and a perfectly flat bedding surface for the clutch disc, both of which also contribute to the ultimate safety for competitive environments. All SPEC flywheels carry SFI certification.

The automotive component most responsible for ensuring optimum clutch performance and life is the flywheel. The flywheel’s contribution to power transfer is three-fold.

Firstly, the flywheel should provide a consistent and friction enhancing surface for the clutch disc. Flywheels also aid in proper inertia, which is determined by the flywheel weight. Inertia controls the ratio of power to acceleration and can make a vehicle faster or slower based on gear ratio, tire type, vehicle weight, power output and even the location in the powerband output is achieved. The weight of a flywheel and amount of inertia it provides can also affect drivability. Lastly, the flywheel must provide a true balance at rpm, which means no dimensional runout that produces engine damaging and power robbing vibrations and allows smooth engine revolutions.

To allow for specific inertia needs, SPEC flywheels are made in high carbon billet steel and aircraft quality billet aluminum. The aluminum and most steel SPEC units are rebuildable and feature a replaceable steel friction plate that is made from a friction- enhancing steel metal specially formulated for optimum clutch bedding and holding power. The aluminum and steel materials provide a light and medium weight option for all types of racing. SPEC spends a lot of time and effort on research and development of optimum flywheel dimensions and weights for all types of driving and racing and can optimize your MOI (moment of inertia) to maximize your car’s output and performance.

Please note: When converting from a factory dual mass flywheel to a lighter solid/single mass flywheel you can expect to hear additional drivetrain noise such as gearbox rattle at idle. This is normal and to be expected as a lighter solid flywheel does not have the same damping effect that a heavier OE dual mass flywheel is designed to do.

Fitment:

BMW 335i

2007 BMW 335i Clutch Flywheel
For use with SB53X-2 clutch kit, will not work with OE style clutch kit

2008 BMW 335i Clutch Flywheel
For use with SB53X-2 clutch kit, will not work with OE style clutch kit

2009 BMW 335i Clutch Flywheel
Up to 1/2009, For use with SB53X-2 clutch kit, will not work with OE style clutch kit

BMW 535i

2008 BMW 535i Clutch Flywheel
For use with SB53X-2 clutch kit, will not work with OE style clutch kit

2009 BMW 535i Clutch Flywheel
Up to 1/2009, For use with SB53X-2 clutch kit, will not work with OE style clutch kit

BMW 535xi

2008 BMW 535xi Clutch Flywheel
For use with SB53X-2 clutch kit, will not work with OE style clutch kit

BMW 335xi

2007 BMW 335xi Clutch Flywheel
For use with SB53X-2 clutch kit, will not work with OE style clutch kit

2008 BMW 335xi Clutch Flywheel
For use with SB53X-2 clutch kit, will not work with OE style clutch kit

BMW 135i

2008 BMW 135i Clutch Flywheel
For use with SB53X-2 clutch kit, will not work with OE style clutch kit

2009 BMW 135i Clutch Flywheel
Up to 1/2009, For use with SB53X-2 clutch kit, will not work with OE style clutch kit

BMW 535i xDrive

2009 BMW 535i xDrive Clutch Flywheel
Up to 1/2009, For use with SB53X-2 clutch kit, will not work with OE style clutch kit

BMW 335i xDrive

2009 BMW 335i xDrive Clutch Flywheel
Up to 1/2009, For use with SB53X-2 clutch kit, will not work with OE style clutch kit