Shimano Cog "B Fit" (12T) (For Dura-Ace CS-7900, Ultegra CS-6700) (1st Position)

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Shimano Dura-Ace CS-7800 & Ultegra CS-6700, 6600 10-Speed Cassette Cogs

Features:
  • 1.6mm cog thickness
  • "A-fit" for Dura-Ace CS-7900, CS-7800 and Ultegra CS-6700, CS-6600 cassettes using 12 tooth 2nd position cogs
  • B-fit" for 105 CS-5700 and CS-5600 cassettes using 12 tooth 2nd position cogs