The OT-RS900 GRX, Dura-Ace Shift Outer Casing helps ensure smooth shifting action of the rear derailleur thanks to its superior construction and materials.
Shimano RD-R9100, RD-R8000, RD-RX800 and RD-R7000 derailleurs must be assembled on the bicycle with the OT-RS900 outer casing.
The radius of the curved cable that is routed from the bicycle frame to the RD-R9100, RD-R8000, RD-RX800 or RD-R7000 becomes much smaller compared to the radius generated with other rear derailleurs, as indicated in the images below. The commonly used outer casing, OT-SP41, is too stiff for such small radius that it could cause issues on the adjustment barrel and shifting problem. By using the OT-RS900, these issues can be avoided as OT-RS900 housing has reduced stiffness.
**OT-RS900 should be used only on the rear derailleur side. It should not be used on the shift/brake lever side.
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Specifications:
- Application: Road, Gravel
- Diameter: 4 mm
- Length: 240 mm
- Recommended Cable Diameter: 1.2 mm
- pre-lubricated with special silicone grease to ensure smooth shifting
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Includes:
- Shimano OT-RS900 shifter cable housing
- Sealed end cap, for rear derailleur
- End cap
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Compatibility:
- Dura-Ace RD-R9100
- Ultegra RD-R8000
- Shimano 105 RD-R7000
- GRX RD-RX810
- GRX RD-RX812
- GRX RD-RX400
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