BBB Cycling Derailleur Pulley Ceramic 13 Tooth Rear 12 Speed Jockey Wheels Scooter Shimano Compatible for Road Bike Urban MTB Bicycle RollerBoys BDP 19

Fast shifting performance: the RollerBoys keep you moving and make your bike ride so smooth that you will never stop again! The special, 13 teeth narrow-wide profile ensures the perfect hold of the chain and ensures that you can switch to a higher gear at the speed of light! Shimano compatible front derailleur wheels: these bicycle discs are compatible with 12-speed Shimano MTB groups Sealed ceramic bearings: RolleyBoys ceramic jockey wheels are equipped with low-friction ceramic bearings and lubricated with special ceramic oil for even more smoothness and exceptional durability compared to CrMo bearings Durable and strong: The composite material made from Grivory EMS is made of 40% glass fibres, which makes it particularly strong and durable compared to other pulleys ALUMINIUM BUSHINGS: The RollerBoys derailleur rollers have anodized aluminum bushings for added stability and protection for the bearings