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 and 19-tooth lower, aluminum pulley wheels with Grade 3 Silicon Nitride balls to provide absolute optimization of the rear derailleur. Robust cage crafted from polyamide and carbon fiber for durability and light weight. Hardened steel bearing races. Two spring tension settings allow customized setup based on ride conditions. Only compatible with Rival AXS 12-speed 36t cassette. Item Specifications: Defined Color, Black, Drivetrain Speeds, 12, Fits Brand, , Fits Model, Rival AXS (electronic), Largest Cog, 36,.
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