Lightweight Hollowtech Ii 105 10-Speed Chainset Innovative Hollowtech Forged & Anodised Aluminium Crank Arms Utilise A Hollow Design That Minimises Flex & Keeps The Weight Low The Chainring Teeth Have Been Developed To Work In Conjunction With The Cn-5701 Chains For Increased Contact To Provide Greater Efficiency & enhanced Power Transfer Hollowtech Ii Allows The Bottom Bracket Bearings To Be Spaced Wider Apart (Outboard From The Frame), Enabling The Use Of Larger Bearings & An Increased Axle Diameter The System Allows For Easier Installation, Adjustment, & Maintenance Lightweight Anodised Sg-X Aluminium Chainrings For Smooth & Precise Shifting For Use With St-5700, St-6700 Or St-7900