FSA CK 745 ISIS E-Bike Crank Arm SetFSA CK 745 ISIS E Bike Crank Arm Set The FSA CK 745 E Bike Crank Arms are purpose built for reliability and performance across a wide range of Bosch drive systems. Designed to fit Bosch Classic, Active, and Performance Line Gen4 motors, these crank arms use a standard ISIS interface, making them a versatile choice for many e bike setups. Manufactured from high quality aluminium, they offer a strong yet lightweight construction that stands up to the