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 faceThe aggressive tooth design provides better chain retention for a smoother, more efficient pedal feel with a focus on long wear-life104mm 4-bolt38TSteelBlack12spNarrow/WideUPC/EAN/GTIN: 710845888403