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NOTE* Item has been installed, returned, has minor scuffing on the crank arms and is fully functionalThe SLX FC-M660 crankset for is designed for Dyna-Sys, Shimano's new 10-speed drivetrain. The goal of Dyna-Sys is to provide the rider with an intuitive gear combination which then translates to more efficient use of power being delivered to the rear wheel. The secret of Dyna-Sys is the 32-tooth Primary Driving Gear which lets riders get the most out of modern suspension designs. Fits 68/73mm bottom bracket shells Steel/glassfibre composite middle chain ring for great durability Hollowtech II hollow-forged aluminum crankarms Durable pipe billet steel axles Wide gear range for all conditions Integrated Crank Spindle Approximate weight 889 grams, including bottom bracket Please Note: This is marked an OE Item because it lacks original packaging. The item has never been installed or used.