PBR Twin Color Aluminium ultralicht zelfreinigend geanodiseerd achtertandwiel 270 520 Amount of teeth:49 teeth New enclosed tip design New enclosed tip design RFX Launch Controls allow you to lower and lock the front suspension to stop the front wheel lifting under hard acceleration off the start gate A profile designed for the teeth that facilitates the evacuation of the mud and minimizes power losses due to friction between the chain and the rear sprocket SX or enduro