ceramicspeed-oversized-pulley-wheel-system-for-shimano-9000-6700-series-coated-bearings-alloy-pulley-carbon-cage-red
ceramicspeed-oversized-pulley-wheel-system-for-shimano-9000-6700-series-coated-bearings-alloy-pulley-carbon-cage-red, The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design.Features two oversized 17-tooth aluminum pulley wheels with Grade 3 Silicon Nitride ballsRobust cage crafted from polyamide and carbon fiber for durability and light weight