-20%

BBB derailleur pulleys RollerBoys 10-T ceramic.Equipped with low-friction ceramic bearings for ultra-smooth gliding and exceptional longevity.Special serrated pattern for faster gear shifting.Special lubrication with light ceramic oil for greater smoothness.Composite material supplied by EMS Swiss in glass-fiber blend (40%).Complete set of spacers compatible with various derailleur systems.With them, you´ll never be done rolling!.