Shimano Ultegra RD-6700-A 10-Speed Rear Derailleur Pulley Set, ver.2

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From Colorado Cyclist

Shimano Rear Derailleur Pulley Assemblies Fits Ultegra RD-6770, RD-6700-A, RD-6700, RD-6600, RD-6500 Saint RD-M810-A, RD-M810, RD-M806, RD-M805, RD-M801, RD-M800 XT RD-M772, RD-M771, RD-M770, RD-M761, RD-M760, RD-M751, RD-M750 XT Trekking RD-T780 Nexave RD-C910 Sealed bearing tension pulley