RADr Cage


 The RADr cage is a replacement derailleur cage for any length Shimano Shadow+, clutch rear derailleur (SS Short cage, GS Med cage and SGS Long cage), including Saint and Zee. Specifically designed for perfect shifting of any extended range 11-42T cassettes. 


  • Dramatically improves shifting performance for Shimano Shadow+ clutch rear derailleurs
  • Cage length is between GS and SS to offer the shortest 42T compatible cage possible
  • Chain Wrap (cassette wear) and Free Chain Length (shift performance) corrected to stock Shimano spec - See chart
  • Tuning your derailleur to achieve perfect shifting with an 11-42 is now much easier
  • Requires Stock B-Screw adjustment (No more removing washers or reversing B-Screws)
  • Improves chain wrap and extends cassette life
  • Provides the lowest possible profile to prevent unwanted cage strikes
  • Installs in under 15 minutes – checkout the install video for full details


The key feature of the OneUp RADr (Radial Appositioned Derailleur) cage is that we’ve moved the upper pulley wheel rearward of the cage pivot to optimize the derailleur for larger sprockets. Now as the derailleur moves into larger sprockets the top pulley wheel automatically moves away to adjust the chain gap, no longer relying on just B-Screw



Material: 7075-T6 Aluminum

Weight: 34g

Colour: Black, Green

Compatibility: Shimano Shadow+ 10spd clutch rear derailleurs

  • Deore (RD-M615)
  • SLX (RD-M675)
  • XT (RD-M786)
  • XTR (RD-M985, RD-M986)
  • Saint (RD-M820)
  • Zee (RD-M640)

Patent pending



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