Hearing the increasing popularity of e-bikes, Race Face has answered the call by modifying our rock solid Aeffect crank arm specifically for e-bike. With increased clearance, while optimizing Q-factor, and a redesigned spline interface to maximize strength. The new Aeffect E-bike Crank is the perfect upgrade for the more discerning e-bike rider. Features Compatible with all Bosch™ e-bike motors. Optimized Q-Factor. Extended spline interface for clearance of additional e-bike motor enclosures. 6066 T6 aluminum construction. Specification Colour: Black. Built For: XC / Trail / AM / Enduro. Spindle Size: Bosch Compatible. Weight: 499g. Size: 165, 170, 175mm.