Shimano GRX RD-RX820 and GRX RD-RX825 rear derailleur pulley wheels. With 11 and 13 teeth. The set consists of a guide pulley and a tension pulley - both with sealed bearings for smooth operation.
Technical information:
- Compatible with GRX RD-RX820 and GRX RD-RX825 rear derailleurs
- Number of teeth: 11T; 13T
- Set includes two pulleys - guide and tension

