This 11V CERAMICSPEED OVERSIZE Shimano R9100 rear derailleur pin is unique in the market.A piece to improve the fluidity of your transmission and gain valuable power for the most demanding competitors.This component is made of high-end materials:the leg is made of lightweight carbon fiber and the two 17-tooth Oversize rollers are made of aluminum.For their part, ceramic bearings have a surface that is 75% harder than steel to resist any friction.In this version, the Oversize leg is compatible with Shimano Dura Ace 9100 rear changes.