Weighing just 2.9kg these competition race flywheels to suit BMW E36/E46 (S52/54) engines are machined from chrome moly steel with an integrally cut ring gear to minimise the moment of inertia. two versions are available to allow the use of either 5 1/2" (140mm) or 7 1/4" (184mm) step fitment competition clutches. The clutch mounting holes are tapped M8 please refer the associated products link below for suitable clutch to flywheel mounting bolts.