The teeth of the Record sprocket set have an Ultra Drive design that integrates the chain and chain wheels of the crankset to ensure fast, precise and consistent shifting through the years. Only four largest cogs are Titanium. The 11-25 combination is also available for this year and is ideal if used with compact cranksets. UltraDrive -nickel-chromed finish for steel sprockets -light alloy carrier -supplied without lockring (except for 11-21, 11-23 and 11-25) RECORD sprockets UD 10 speed steel -titanium 11-21-174g, 11-23-188g, 11-25-190g, 12-23-191g, 12-25-190g, 13-26-208g, 13-29-232g