- Designed for use with SRAM's XX SL Eagle power meter, these Thread Mount replacement rings are purpose made for use with the XX SL proprietary spider design - This chainring mount system allows reduced weight without compromising reliability - Proprietary Thread-Mount design specifically for use with XX SL Power Meter spiders - Compatible with T-Type chains - SRAM Threaded chainring tool required for removal/installation (GS95055) - Includes pin thread backup and screw