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Whether your biggest cog on your X01 or XX1 is worn out or you just like a flash of a little more cassette color, the Wolf Tooth GCX 42 sprocket is exactly what you need. Shifting performance and durability matches the stock part, and install only takes 5-10 minutes.



  • Only compatible with X01 and XX1 cassettes, XG1195 or XG1199
  • NOT compatible with any other cassettes

Complementing products:

Tech Specs:

  • Detailed step-by-step instructions are available here.
  • Only mount to X01 and XX1 cassettes, XG1195 or XG1199
  • Design and manufactured in the Minneapolis, MN USA
  • Material 7075-T6 Aluminum
  • Colors - Black, Blue, Red, Green, Silver
    • Weight - 83g