Thickness:4mm; Length:16.5cm; Diameter of center hole:37mm??Compatible with 415 chain and 415h chain
10.5mm bolt hole diameter of the larger 3 holes that bolt to sprocket; 80mm measurement from center of large hole to center of larger hole that bolt to sprocket
Compatible with stocked installation kit 9 hole set; Compatible with 1.5 inch adapter of bike rear hub; Compatible with 1 inch adapter of bike rear hub ;
Compatible with spoke wheel and mag wheel which are designed for motorized bicycle;
Package: 1pc 40 teeth sprocket only; Excluding bolts; Any questions,please contact us firstly! we can help you solve the problem until you are satisfied.