Featuring four titanium cogs, the new Shimano Dura-Ace CS-7900 10-Speed Crankset has further improved shifting quality by creating a more rigid aluminum carrier unit along with a re-engineered tooth profile. Shimano also successfully reduced the weight of the rear wheel assembly by 10 grams. Revised gear sprocket design created precise and reliable shifting 8 cassette combinations to accommodate more cyclists Rigid and lightweight aluminum carrier Four lightweight titanium sprockets Weight: 163.2g (11-23T)