Shimano rear derailleur replacement guide and tension pulley set Suitable for a range of rear derailleurs RD-5800-SS/5701/5700-A/5700/4700/4600/3500/3400/R2000/2400/R350/R350-10/RX400/M7000-10/M675/M670/M663/M662/M640/M6000-SGS/M615/M610/M601/M593/M592/M591/M4000/M430/M3000/M390/M370/M2000/T670/T661/T6000/T610/T4000/T3000/F800/CT-S500 Its recommended that you replace your derailleur pulley wheels periodically for the best shifting performance Set comprises of two pulley wheels and is a genuine Shimano replacement part
