Universal Parts Replacement Rear Sprocket for the following CHAIN DRIVEN compatible with Razor Electric Scooter s: E100/E125 (version 33+) E150 (version 18+) E175 (version 29+) Please Click Here for a guide on how to identify which compatible with Razor version you have. Same Sprocket as used with compatible with Razor Part #W131 Universal Parts Replacement Rear Sprocket for the following CHAIN DRIVEN Razor Electric Scooters: E100/E125 (version 33+) E150 (version 18+) E175 (version 29+)