Shimano Ultegra 10-speed CS-6600 Cassette

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Shimano Ultegra 10-speed CS-6600 Cassette

Compatible with all Shimano 9 and 10 speed freehubs. Largest cogs are on a carrier to reduce weight and reduce freehub spline stress. Specify Size 11-23, 12-23, 12-25, or 12-27.