RaceFace Turbine Mountain Bike Crankset Weight: 850g Arms are carefully engineered using ultra-high strength 7050 aluminum alloy to maximize strength to weight ratio Fully forged for maximum fatigue resistance and then extensively CNC machined for that classic Race Face look Aggressive I-Beam profiling minimizes weight while maintaining stiffness and strength Incorporated crank bolt puller cap makes crank removal a snap with just an 8mm hex wrench