... quality and long life time Item No: Crown & pinion ( rear) 99012320181 with ratio 21-29A: Features1) Material: Steel(20CrMo, 20CrMoTi, 42 ... built between us.Mobile:+86-13657687302Trademanager:cqyongyue Crown & pinion ( rear) 99012320181 with ratio 21-29