18 Tooth Replacement Cog for SRAM and SunRace 11-speed


Replacement cog for 11-speed SRAM and SunRace cassettes.

  • Remove the 17 and 19t cogs and replace them with the 18t for GC49 conversions.
  • Installation instructions on the GC tech page.
  • These are specifically designed for use with SRAM and SunRace cassettes.  The clocking, or rotational orientation, between SRAM and Shimano cassettes is much different so optimal shifting cannot be achieved unless the design is optimized for each separately.
  • Design and manufactured in Minneapolis, MN USA



SRAM 11 speed cassettes

  • NX 11-42 (PG-1130)

SunRace 11-speed cassettes

  • CSMS8 (11-42)
  • CSMS7 (11-42)
  • CSMX8 (11-42)

Tech Specs:

  • Black Oxide Steel with laser marking
  • The cog is 1.6mm thick and weighs 22g
  • Colors- Silver