21T(BSFB5821). 20T (BSFB5820). 19T (BSFB5819). KMC Chainring for Bosch E-Bike 1/8". 18T (BSFB5818). Reinforced chainring for the Bosch ebike engine. More durable than the normal chainring. They are ideal for the drive systems of the Performance Line and Active Line.
