The 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 systemsCompatible, but not optimized, for use with Bosch Gen 2 drive systemsConstructed of 7050 AluminumItem SpecificationsColorBlackDefined ColorBlackDesigned for ebikeYesPedal Spindle9/16"Spindle Interface TypeISIS RaceFace Aeffect R eBike Crank Arm Set eBike Crankset UPC: 821973497105