A fresh look at pulley design, maximizing pulley size and improving pedaling performance for any derailleur. Redesigned pulley teeth provide better chain retention and accurate shifts every time. Updates to newest version include: increased stiffness using A-shaped pillars between the bearings and teeth, maximized tooth count for every derailleur helps deliver optimal drivetrain performance, and enhanced visual design achieves a more cohesive look across the different models. Cross seals are built for leaving the beaten path, offering the best durability, regardless of the weather conditions