- 240 mm, 4 mm diameter SIS OT-RS900 outer cable casing specifically developed for Dura-Ace R9100 rear derailleur
- More pliable than SP41 outer casing, designed to work specifically with the Dura-Ace R9100 Shadow derailleur without B-tension spring
- Lubricated internally along its length with low-friction silicon grease to reduce cable friction
- Special construction process makes for an axially stiff casing that transmits shifting movements accurately and quickly
- Lined with a polymer sheath to assist with the smooth operation of the inner wire
- For use with 1.2 mm diameter Polymer coated inner wires
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