FSA CK-320 Bosch Gen3 E-Bike Crankarms Solid Foundation for the Motor-Assisted Mile When you're spec'ing or replacing crankarms on a Bosch Gen3 e-bike, you need parts engineered to work with the motor system, not just bolted alongside it. The CK-320 uses the Bosch BNI spindle interface, so fitment is direct and correct. Diecast aluminum construction keeps things durable and cost-effective, and the bead blasted black finish with printed graphics looks clean on any build. Features Bosch Gen3 compatibility uses the Bosch BNI spindle interface for direct, system-correct fitment Diecast aluminum construction durable and reliable for everyday e-bike use Painted bead blasted black finish clean look with printed graphics that holds up to trail and commute use Armset design sold as a pair, making replacement or build spec straightforward | Fsa | Ck-320 Bosch Gen3 E-Bike Crankarms 170Mm | Aluminum