BBB Cycling Derailleur Pulley 11 T and 13 Rear Shimano Speed Jockey Wheels Roller Urban Road Bike MTB Bicycle RollerBoys 11T BDP 08, Black

QUICK SHIFTING PERFORMANCE: The RollerBoys will keep you rolling and make your bike ride so smooth that you will never stop anymore! The special 11- and 13-teeth pattern makes sure you can shift to a higher gear with the speed of light! SHIMANO COMPATIBLE DERAILLEUR WHEELS: These bike pulleys are compatible with 11-speed Shimano GRX (810/815) SEALED CHROMOLY BEARINGS: The RollerBoys Jockey Wheels are Equipped with sealed CrMo bearings for longer durability and silent operation compared to pulley wheels without ball bearings DURABLE AND STRONG: Made of Grivory EMS, this composite material has a 40% glass-fiber mixture which makes it extra strong and durable compared to other derailleur pulleys ALUMINIUM BUSHINGS: The RollerBoys Derailleur Pulleys have anodized Aluminium bushing for added stiffness and extra protection for your bearings