absoluteBLACK Oval 104 BCD Chainrings are designed for use with all cranksets with a 104 BCD interface, including Shimano, SRAM, RaceFace, FSA, and more. They are crafted from CNC machined 7075 aluminum, and feature an anodized finish for exceptional durability. Ovality has been optimized for each chainring size, ranging from 10.2 - 14.4%, with timing of 110.5 - 116.3 degrees after TDC (top dead center).