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Have a 10 speed Shimano cassette? Do you climb a lot? Consider upgrading your cassette to a more climb-friendly gear ratio with the Wolf Tooth Components GC 42 + 16t Cog Bundle for Shimano 11-36t 10-Speed Cassettes. This replaces your 36t, 15t and 17t cogs, revamping your gear range for smoother shifting and more versatility so you can climb harder, longer.
7075-T6 Aluminum
Requires Replacement of the Cassette's Original 15T and 17T Cogs
10-Speed Cassettes – Compatible only with the following Shimano 10 speed Cassettes: XT 11-36t (CS-M771) and XTR 11-36t (M980).
Compatability – Work best with medium or long cage rear derailleurs - 2x10 drivetrains require a long rear derailleur.