The Hollowtech Ii 10-Speed Cx 50 Cyclo-Cross Chainset Is The Perfect Choice For Enthusiast Riders Alloy Chainrings Are Both Rigid & Lightweight The Chainring Teeth Have Been Developed To Work In Conjunction With The 10-Speed Directional Hg Road Chains For Increased Contact To Provide Greater Efficiency & enhanced Power Transfer Industry Leading Cold Forged Crank Arms Have Been Evolved To Increase Rigidity, Reduce Weight & Improve Strength 2-Piece Cap-Free Design Is Quickand Easy To Install Whilst Being Lighter & Stiffer Than A Traditional Crank / Bottom Bracket Assembly Integrated Bottom Bracket Seal Design Has Minimal Bearing Interface Ensuring Smooth Rolling & Increased Durability 46 / 36T Chainrings Using 110 Mm Bolt Circle Diameter