SRAM Rival Flattop 12 speed ChainThe Flattop technology of the SRAM Rival chain creates a lighter, quieter, stronger chain thats compatible with 12 speed 1x and 2x eTap AXS drivetrains. Ride far, long and fastthis chain can go the distance. Flattop technology allows for a narrower chain with quieter operation and increased strength and durability Use for both 1x and 2x eTap AXS Includes Flattop PowerLock