Shimano Jockey Wheels.
Shimano Pulley Set Guide and Tension Pulley for Rear Derailleur RD-6700
Shimano Pulley Set RD-6700 - Jockey Wheels - Y5X998150 - Ultegra, XT, Saint 11T
Shimano Pulley Set RD-M6000 SGS - Jockey Wheels - 11T for SLX Long Cage 10-Speed
Shimano Pulley Set RD- M3020, M2000, M370 And more see Compatibility 7/8/9 Spd
Shimano Pulley Set RD-5700 - Jockey Wheels - 11T for Deore, SLX, 105, Tiagra
Shimano Pulley Set RD-M3100, M3020, M2000, M370 - Jockey Wheels, 7/8/9 Spd
