- Heat treated special steel sprocket to fit E-Bikes with a Bosch Motor. EBIKE BOSCH MOTOR * Compatibility: Performance Line drive system * Chainring Teeth: 14 - 15 - 16 - 17 - 18 - 19 - 20 * System: Active Line drive * Material: Heat treated special steel sprocket * Colour: Black * Sprocket Weight: 32g