SRAM XX SL Eagle T-Type Thread Mount Chainring - 36t 12-Speed Thread Mount For XX SL PM Spider 3mm Offset Aluminum BLK/SilverSRAM XX SL Eagle T Type Thread Mount Chainring 36t 12 Speed Thread Mount (For XX SL PM Spider) 3mm Offset Aluminum Black Silver. Designed for use with SRAMs 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