This is a 96mm BCD chainring for a 1X chainring for XTR M9000 crankset with the proven chain retention of our Drop-Stop chainring. They fit only the Shimano XTR M9000 and M9020 cranksets (race and trail respectively). They have an asymmetrical 96 mm BCD with built-in threaded standoffs to provide the ideal 1X chainline.