Helix Race e*spec Alloy Cranks offer a high-performance alternative to carbon fiber for riders who prefer alloy or dont want to pay for carbon to get a premium product. Forged and extensively CNC finished, the Helix Race e*spec Crank is a piece of machining art to personalize your fit and ideal e-bike build.These cranks are a serious upgrade that will increase strength and pedal strike resistance while reducing your bikes weight. Available in shorter lengths for improved pedal clearance on low BB frame geometries. Equipped with built-in alloy self-extracting crank bolts for ease of installation and removal when its time to service.Compatible with Bosch®, Brose® S Mag, TQ®, Fazua®, Yamaha®, DJI Avinox®, Maxon®, Sram®, and Specialized® SL 1.1 and 2.2 motor systems. They feature narrow offsets for a traditional MTB Q Factor feel while offering enough clearance for motors and chainstays.Dont let the lightweight fool you: Helix Race e*spec Alloy Cranks are tested to our exacting E-Endur