1、Carbon Steel Material: The bicycle sprocket is made of carbon steel, ensuring that it does not break easily with repeated use, and is wearproof. The inner hole size is 17 x 12mm. 2、Compatible Motor: The motor sprocket is simple to install and does not require too much time, making it suitable for both brushless and brushed center motors. 3、Perfect Replacement: An ideal choice for replacing damaged, broken, or unusable sprockets. It perfectly replaces the original product, and its lightweight and portable design adds to its appeal. 4、High Accuracy Internal Thread: The high accuracy of the internal thread ensures a tight connection with the bicycle hub and stable running, enhancing overall performance. 5、High Reliability: Professionally manufactured, the motor sprocket delivers stable performance and high reliability, promising a satisfying user experience.