BBB RollerBoys Derailleur Jockey/ Pulley Wheels With Ceramic Bearings
11T Compatible for all Road/MTB Shimano 9 & 10 speed / Mega Range.
Composite material provided by EMS Swiss, with 40% glass-fibre mixture giving unmatched stiffness and precise shifting.
Equpped with ceramic bearings for ultra smooth gliding and almost no resistance.
All bushings for different shifting systems are included.