Designed for use with our new RED XPLR AXS power meter, these replacement rings are specifically made for use with a Thread Mount spider design. This chainring mounting system allows us to minimize weight, maximize stiffness and accuracy, and maintain the ability to swap ring sizes. Thread Mount design is light, stiff and accurate Compatible with all road Flattop chains SRAM Thread Mount Chainring Removal Tool required for installation Sram Article number: Retail packaging: Yes