CeramicSpeed OSPW X Oversized Pulley Wheel System for SRAM Eagle AXS - Coated, Alloy Pulley, Carbon Cage - 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 14-tooth upper pulley wheel and a 18-tooth lower pulley wheel to provide absolute optimization of the rear derailleurFits 10-50 tooth cassette rangeOffers up to 40% efficiency savings, compared to the stock SRAM Eagle cageRobust cage is crafted from carbon reinforced polyamide for durability and light weightThe narrow wide tooth profile ensures durable chain retentionThree spring tension settings allow you to customize performance and reduce chain drag