RaceFace Aeffect-R Ebike Crank Arm Set - 165mm, For Bosch Gen 4 and Gen 5 Drive System, 7050 Aluminum, BlackThe RaceFace Aeffect R eMTB cranks bring the burly, purpose driven design of Aeffect R to the Bosch drive system for seamless motor integration. Optimized for use with Bosch Gen 4 Performance Line CX drive systems Compatible, but not optimized, for use with Bosch Gen 2 drive systems Constructed of 7050 Aluminum Product Specifics Color: Black Pedal Spindle: 9 16" Spindle Interface Type: ISIS Designed for ebike: Yes Defined Color: Black Today's Stock