The STEPS FC-E8000 eBike crank arm set is designed for use with the STEPS E8000 eBike drive untis. Designed for e-MTB riding. Use with SM-CRE80 chainrings (sold separately). Compatible with 50mm and 53mm chainlines. Item Specifications: Color: Black, Crank Length (mm): 165, Pedal Spindle: 9/16", Spindle Interface Type: Hollowtech II, Designed for ebike: Yes, Defined Color: Black,