Shadow-style road rear derailleurs from Shimano require a specific housing section for the final loop into the cable adjuster. The OT-RS900 Rear Derailleur Shift Cable Housing provides the flexibility that standard OT-SP41 housing cannot deliver in this application. Shimano's R9100, R8000, RX800, and R7000 rear derailleurs route the cable through a much tighter radius than previous generations, and stiff housing creates drag that affects shifting precision and barrel adjuster function.

Each 240mm segment uses a coiled construction that allows the housing to bend through tight radii without binding or resisting cable movement. The interior comes pre-greased to reduce friction from the start. Shimano specifies this housing exclusively for the rear derailleur loop and recommends using standard OT-SP41 housing elsewhere on the drivetrain where the bends are more gradual and stiffer housing maintains better shift response.

The package includes everything needed for installation: an alloy ferrule for the derailleur end, a plastic sealed ferrule for the inbound side, and the nose cap that protects against cable fray at the adjuster entrance. That nose cap is a wear item designed to be replaced each time you swap cables. The housing works with both Polymer-coated cables and the Optislick cables that come stock with R7000 drivetrains.... Read More