Rear - Front sprockets Rear sprocket for SFM ZX 125 4T 11-13 MJ Corse MJ.674 €34.15 High quality duraluminium (ergal) rear sprocket for SFM ZX 125 4T 11-13 with chain pitch 428 and with number of teeth from 34 to 64. Select the chain pitch and number of teeth you need by clicking below. Add to cart