The Bosch Chainring 20T Chainring This 11-speed compatible chainring is made of an high-performance steel with special properties and surface treatment, developed to meet extreme mechanical demands, necessary for this type of application to ensure a long lasting life. Active/Performance drive pinion with 20 teeth. Original Bosch chainring with 20 teeth for all Active & Performance Line e-bikes.  Bosch Chainring 20T Chainring Features  Reinforced chainring for the Bosch ebike Motor More durable than the normal chainring Does not change the high speed but only the translation