These cranks are a serious upgrade that will increase strength and pedal strike resistance while reducing your bikes weight. Available in eMTB rider-preferred lengths for improved pedal clearance on low BB frame geos. 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®, Maxon®, Sram® motor systems using the 24mm ISIS standard. They feature narrow offsets for traditional MTB Q Factor feel while offering enough clearance for motors and chainstays.Dont let the light weight fool you. The Helix Race e*spec Alloy Cranks are tested to exceed E-Enduro EN17406 Class 4 standards and come equipped with custom crank boots for heavy hitting, impact resistant confidence on any terrain.