Shift cable and housing set Shimano DURA-ACE R9100 polymer-coated black

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.