Designed for use with a 104 BCD interface of any 104 BCD spider, This chainring utilizes SRAM's T-TYPE design and is backwards compatible with Eagle technology (X-SYNC II). SRAM drivetrain engineers optimized this ring to combat the high-torque, high-wear situations e-bike riders face. The aggressive tooth design provides better chain retention for a smoother, more efficient pedal feel with a focus on long wear-life. High durability steel construction. Backwards compatible with other Eagle Technology. AeroGuard compatible with steel rings that Fufills EN 15194:2017 standard.