Shimano Ultegra-6600 10sp Cassette 16-27
10-speed Super Narrow HyperGlide compatible cassette (remaining ranges also compatible with newer Ultegra-6700 drivetrain). Fits 9-speed spacing (older 9sp freehubs require spline shim). Single, 6-arm aluminum carrier (3 largest cogs) reduces weight and increases stiffness. Nickel plated steel cogs for increased durability. 235g @ 12-23t.
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