These competition race flywheels to suit BMW E92 (S65) engines are machined from chrome moly steel with an integrally cut ring gear with versions available to allow the use of either 5 1/2" (140mm) or 7 1/4" (184mm) step fitment competition clutches. They replicate the O.E. crank trigger mechanism and feature a 50mm offset from the crank mounting face to the flywheel friction surface ensuring full spline engagement on an O.E. input shaft and aftermarket transmissions using a similar spline position. The clutch mounting holes are tapped M8 please refer the associated products link below for suitable clutch to flywheel mounting bolts.