Wheels Manufacturing Derailleur Hanger #521 is a direct CNC-machined 6061 aluminium replacement for the sacrificial hanger that bolts the rear derailleur to the frame — the part that's designed to bend or snap in a shift-into-the-spokes crash so the frame and derailleur don't have to.

Compatibility & fit

Confirmed fitment per Wheels Manufacturing / SCV:

  • M6x12mm Socket Head, M5x22mm Socket Head - Specialized: S196000002
  • Specialized: - Fuse - 2020+

Derailleur hanger fitment is frame- and year-specific — match Hanger #521 against the old hanger (or the exact frame model and year) before ordering. The Tune workshop can fit a new hanger and align it on the bike; derailleur hanger alignment is a workshop service, not something to skip after a hanger swap.

Covered by Wheels Manufacturing's 1-year limited warranty against manufacturing defects from the original date of purchase. It doesn't cover misuse, normal wear and tear, incorrect installation or crash damage. For warranty support, return the product to Tune Cycles and we'll manage the claim with Wheels Manufacturing's Australian distributor.
  • Direct replacement for Wheels Manufacturing Derailleur Hanger #521
  • CNC-machined 6061 aluminium
  • Sacrificial design protects the frame and rear derailleur in a crash
  • Fasteners included where specified by Wheels Manufacturing
Hanger numberWheels Manufacturing #521
Material6061 aluminium, CNC-machined
FitsSpecialized — see compatibility list
FittingWorkshop fitting and derailleur alignment available at Tune Cycles
SKU SCV-WMDH-521
Brand Wheels MFG