BBB BDP-08 RollerBoys derailleur pulley

Composite material provided by EMS Swiss, with 40% glass-fiber mixture
Sealed bearings with aluminium cover for optimal durability
Compatible with 11-speed Shimano GRX (810/815)

The RollerBoys will make your bike ride so smooth that you will never stop anymore! The composite material is strong and durable and the special teeth pattern makes sure you can shift to a higher gear with the speed of light! High-quality pulley wheels are a must-have for every serious bike rider, with the RollerBoys you are good to go!