QUICK SHIFTING PERFORMANCE: The RollerBoys derailleur jockey wheels make shifting gears a breeze thanks to the 11-teeth pattern WIDELY COMPATIBLE: The derailleur jockey wheels are suitable for use with Shimano, SRAM and Campagnolo systems with 9- 10- and 11-speed DURABLE: The Pulleys are made of a composite material provided by EMS Swiss, with 40% glass-fiber mixture ULTRA SMOOTH: The jockey wheels have low-friction ceramic bearings with oil lubrication for an exceptional smoothness and durability BUSHINGS INCLUDED: The derailleur jockey wheels come with a complete set of bushings for different shifting systems
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