CeramicSpeed SRAM Mechanical 10/11-speed Oversized Pulley Wheel System: Black
CeramicSpeed SRAM Mechanical 10/11-speed Oversized Pulley Wheel System: Black, 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 a 13-tooth upper pulley wheel and a 19-tooth lower pulley wheel to provide absolute optimization of the rear derailleurFeatures two 17-tooth alloy pulley wheels and extremely low friction pulley bearingsPrecision machined aluminum pulleysCarbon fiber cageGrade 3 Silicon Nitride ballsHardened races