Sale Shimano OT-SP41+OT-RS900 Polymer Shift Cable Set for R9100/R8000

The secret of the Shimano OT-SP41 Polymer Shift Cable Set is polymer coating that when viewed under a microscope looks like a series of tubes wrapped around the cable. This means less surface area rubbing the internal housing liner and it holds grease longer. The rear derailleurs RD-R9100, RD-R8000, RD-RX800 and RD-R7000 must be assembled on the bicycle with a special outer casing, OT-RS900.

The secret in polymer coating is that when viewed under a microscope it looks like a series of tubes wrapped around the cable. This means less surface area rubbing the internal housing liner and it holds grease longer. Main benefits are significantly less shifting effort and the feeling of a quicker shift action also improves braking power with remarkably less brake lever effort.

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.