... Parts Co.,LtdValen Machinery is a professional gear manufacture.As clients demand,we often use the A3 steel ... C45 steel material,we also meet your material demand.As you know,the motorcycle front gear teeth from ... 17T,and rear gear teeth from34T--57T.and chain model is 415.420.428.520.530,etcsurface treatment is ... your demand.We also meet your size and other model design to finish te product or to make ...