Race Face Aeffect eBike Crank Arm Set - 175mm, For ISIS spline Bosch, Yamaha, and Brose Motors, BlackSpecifically designed for eBike use, this is a modified version of the rock solid RaceFace Aeffect crank arm. The crank arm features increased clearance, optimized Q factor, and a redesigned spline interface to maximize strength. The new Aeffect eBike Crank is the perfect upgrade for the more discerning eBike rider. Compatible with Bosch Performance line eBike motors Extended spline interface for clearance of additional eBike motor enclosures 6066 T6