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Replacement cog for 11-speed Shimano cassettes.

  • Remove the 17 and 19t cogs and replace them with the 18t for GC49 conversions.

  • These are specifically designed for use with Shimano cassettes. The clocking, or rotational orientation, between SRAM and Shimano cassettes are much different so optimal shifting cannot be achieved unless the design is optimized for each separately.



Shimano 11-speed cassettes

  • SLX 11-42t (CS-M7000)
  • XT 11-40,42,46t (CS-M8000)
  • XTR 11-40t (CS-M9000)

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Cassette Cog


Tech Specs

Weight: 22g
Width: 1.6mm
Material: nickel plated steel
Made in the USA

  WARNING Handling this product will expose you to chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For further information go to​

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