SRAM CHAIN RING T-TYPE 104 BCD STEELSram: Designed for use with a 104 BCD interface of any 104 BCD spider, This chainring utilizes our 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. FEATURES 104 BCD Compatible.