Race Face Turbine SL 9 Speed Triple Chainset: The Turbine SL crank continues the Race Face tradition for excellence in aluminium cranks. Arms engineered using ultra-high strength 7050 aluminium alloy to maximise strength to weight ratio Fully forged for maximum fatigue resistance & then extensively CNC machined Aggressive I-BEAM profiling minimises weight while maintaining stiffness & strength Race Face Turbine chainrings are 100% CNC machined from super hard 7075 aluminium to maximise wear & resistance & impact strength EXI interface external bottom bracket system for easier crank installation & removal with standard tools & fully adjustable chainline All alloy TORX hardware keeps weight down Incorporated crank bolt puller cap makes crank removal a snap with just an 8mm hex wrench Comes with the high performance Turbine BB Built for XC Racing/ Trail/AM