SRAM Threaded Mount X-Sync Chainring Red E1Designed for use with SRAM's new RED XPLR AXS power meter, these replacement rings are purpose made for use with a Thread Mount spider design. This chainring mount system allows riders to minimize weight, maximize stiffness and accuracy, and retain the ability to swap ring sizes. Thread Mount design is light, stiff, and accurate Compatible with all SRAM road Flattop chains Includes thread back up pin for chainring SRAM Thread Mount Chainring Removal