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EFFICIENT SHIFTING: The RollerBoys rear derailleur jockey wheels make shifting gears a breeze thanks to its 11-teeth pattern WIDELY COMPATIBLE: Suitable for use with a range of systems: Shimano 9-speed, 10-speed, and 11-speed, Campagnolo 9-speed, 10-speed and 11-speed, and SRAM 9-speed, 10-speed and 11-speed DURABLE: the derailleur jockey wheels are stronger than regular Nylon materials thanks to a 40% glass-fibre mix STEALTHILY QUIET: Sealed CrMo bearings make for a quiet and smooth operation compared to pulley wheels without ball bearings URBAN AND ROAD BIKES: these pulley wheels are suitable for road bikes equipped with either Shimano, SRAM or Campagnolo