R-series rear derailleurs are designed to work with 7, 8 ,9, and 10-speed Shimano-compatible road shifters. These R8 rear derailleurs have composite and steel parts that weigh more but have the same durability and performance as R9 and R10.

• Long cage for triple 28T setup
• Steel pulley cage for extra durability
• Not compatible with Shimano Tiagra 4700 road system