Rear sprocket 428er chain, shaft 50mm, available from 24 to 36 teethSplit anodized steel axle sprocket For 428 / 12,7 / 08B1 chain For 50mm shaft Weight 0.911 kg (average) For key 8x6mm and 6x6mm Available from 24 to 36 teeth Direct mounting on shaft without holder Easy mounting without shaft disassembly (pulley in 2 parts)