1,High friction coefficient 2,OEM manufacturer 3,Motorcycle brake manufacturer 4,ISO9001:2008 Certificate Model YJ250-2MaterialADC12/Y113ColorOptionalAxle hole (mm) φ17Chain wheel specification 428No. of gears 38,39,40,42,46Suitable for motorcycles Feng bao tai zi, Chao guang 125 China motorcycle factory YJ250-2 chain pulley seat