Derailleur pulleyorigine from Shimano, to be mounted on derailleur SHIMANO 105 11 Speeds. The derailleur rollers ensure the tension and the guidance of the chain during the passage of your speeds. The roller and also called "Puley" It ensures the movement of your chain, while the bottom named "String" its role and this responsible for the tension of the chain. In order to have a good precision and an optimal fluidity, the derailleur rollers must always be in good condition. They will be compatible with the rear derailleur ranges SHIMANO 105 R7000, SHIMANO 105 5800, SLX M7000, DEORE M6000, METREA U5000. Technical characteristics of the roller kit Shimano 105 RD-5800 11 Speeds: Type of use: RoadDerailleur compatible: RD-R7000-GS, RD-R7000-SS, RD-5800-GS, RD-M7000-11-GS, RD-M6000-GS, RD-U5000-SSRange compatible: SHIMANO 105 R7000, SHIMANO 105 5800, SLX M7000, DEORE M6000, METREA U5000Number of gears: 11Clevis type: Medium/ShortPackaging: Set of 2 pieces (top/bottom)