The special OT-RS900 outer cablel from Shimano for RD-R9100, RD-R8000, RD-R7000, RD-RX800, RD-RX810, RD-RX812 and RD-RX400 rear derailleur.
Purpose of OT-RS900 – The radius (r) of the curved cable that is routed from the bicycle frame to the RD-R9100 become 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 technical problems on the adjutment barrel and disturb quick and smooth engagement and disengagement of the rear wheel from the frame. By using the OT-RS900, such problems can be avoided as the stiffness is reduced on OT-RS900.
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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