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- Cassette-cog set, Shimano CS-6500 "Ultegra", Hyperglide, 9-speed, 11-21t, steel, 220gm.
- Three largest sprockets are mounted to an alloy carrier to reduce weight. Computer designed. HyperGlide shift ramps and tooth profiling for faster and more precise shifts.
- Chrome plated steel cogs for increased durability.
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