型号：60BTB20
厂商：Martin Sprocket & Gear
大小：21.81 Mbytes
页数：共122页
功能：Sprocket; Taper-Lock bushed 2012; 60 chain; 3/4" pitch; 20 teeth
型号：60BTB20H
功能：Sprocket; Taper-Lock bushed 2012; 60 chain; 3/4" pitch; 20 teeth; hardened
