CeramicSpeed Oversized Pulley Wheel System SRAM Red/Force AXS - 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 15-tooth upper pulley wheel and a 19-tooth lower pulley wheel to provide absolute optimization of the rear derailleurFits cassettes from 10 to 33-toothRobust cage crafted from carbon reinforced polyamide for durability and light weightTwo spring tension settings allow customized setup based on ride conditions