BBB Cycling Derailleur Pulley 13 Teeth Rear Shimano 12 Speed Jockey Wheels Roller Urban Road Bike MTB Bicycle RollerBoys 13T BDP 09

QUICK SHIFTING PERFORMANCE: The RollerBoys will keep you rolling and make your bike ride so smooth that you will never stop anymore! The special 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 12-speed Shimano MTB groupsets 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