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The WolfCage derailleur cage is a modified inner derailleur cage (facing the bike) and eccentric upper jockey wheel for Shimano 11 speed rear derailleurs that improves chain wrap and derailleur capacity. This is required for 11-49 cassettes (11-42 cassette + the Wolf Tooth GC 49) and also improves shifting and drivetrain life on other wide range cassettes.  

The WolfCage installs in a couple minutes and simply replaces the stock inner cage and upper jockey wheel. You will not need to break your chain or remove your rear derailleur from the bike — much simpler than systems that replace inner and outer cages.


  • Wolfcage is compatible ONLY with Shimano 11-speed rear derailleurs.  See the list below. Be sure to select the right cage length. Here are the pulley center to center distances for each cage type so you can be sure to order the right one (GS is the "medium cage" and SGS is "long cage" length):
    • XTR M9000 GS uses XTR-GS - 84mm
    • XT M8000 GS uses XT-GS - 88mm
    • XT M8000 SGS uses XT-SGS - 107mm
    • XTR Di2 M9050 GS - Not supported
    • XT Di2 M8050 GS uses XTR-GS - 84mm

Complimenting Products

  • Shimano GC 49 and SRAM/Sunrace GC 49
  • GCX 44, GCX 46
  • GC 45

Tech Specs:

  • Includes inner cage + upper pulley and eccentric bearing
  • Installation instructions on WolfCage Tech and Install Page.
  • See compatibility section for which cage fits your derailleur
  • Design and manufactured in Minneapolis, MN USA
  • Material 6061-T6
  • Colors - Black
    • Weight - 22g (cage plus upper jockey wheel) 

      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​