?Size: 420-11T 17mm Chain Front Sprocket ?Easy To Use: Motor engine sprocket is easy to install and disassemble, only simple tools are needed, replacement can be completed quickly, and it is reliable and durable. ?Motor engine sprocket has good toughness, durability and long life. It is an excellent accessory for electric scooter. ?Please allow 1-2mm error due to manual measurement. Thanks for your understanding. ?Please check whether your model and parameters are consistent with ours. › See more product details