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. Model: CR-TTYP-104-A1 104 BCD compatible Steel (34T,36T,38T) Backwards compatible with X-SYNC 2 AeroGuard compatible Hex Nuts and Bolts included