Ford Zetec billet flywheel focus st170 for standard clutch Ultra lightweight 4.6 kg with integral ring gear It has the timing holes in the back of the flywheel for the pickup for the crank sensor. Fast road or race 4.6kg the standard flywheel is over 13.8kg There are 3 types we have all 3 in stock 220mm – Not ST170 230mm 240mm This is the size of the clutch drive plate please state size in shipping notes Material ? EN24T Chrome Moly