Simple but durable
Pulleys are compatible with 11T derailleur machined with high-strength aluminum alloy it solid and durable. Ours outward with simplified line shape and ideal angle by the lateral force of chain is able to keep horizontal floating when speed changed. In addition, double-sealed bearing not only fluently transitions with a pulley to the derailleur but also cuts down on foreign elements such as dust or water. That’s means without much drag it could conversion your power to the rear wheel gallop on your way.