Shimano CS-6600 Wide 10-Speed Cassette
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The Shimano CS-6600 Wide 10-speed cassette is specifically designed to meet the demands of junior category racing cyclists that must adhere to gear restrictions during competition. These cassette ratios, with their larger-than-normal smallest cogs, are designed to be paired with standard-sized road double chainrings (typically a 53/39T combination) to meet the gear restrictions. Note that in modern-day frames with carbon fiber tubing, using a cassette with the smallest cog size of 13 through 16 teeth may not be compatible with the chain stays and/or seat stays. Also, due to compromises in shifting performance, Shimano recommends that these cassettes only be utilized with a double chainring crankset, not a triple crankset.