HORN plastic chain guard Catena 14es Bosch - high quality plastic chainring cover for the Bosch eBike system MY2014 Comfort Line and Performance Line - The chain guard is clipped directly onto the motor housing at the front, an additional mounting adapter is not required - drive chainring front from 15-20 teeth - for hub and derailleur gears - the chain guard can be mounted/dismounted with a few simple steps without removing the crank if required.