Shimano Ultegra FC-R8100 12-Speed Chainring - 34t Asymmetric 110 BCD BLK NKShimano Ultegra FC R8100 chainrings are constructed with high quality aluminum and are compatible with FC R8100 and FC 8100 P 2x 12 speed cranksets. Asymmetric 110 BCD Compatible with HG 12 speed chains Color Black Ring Position Type Inner Tooth Count 34 Round or Oval Round Drivetrain Speeds 12 Chainring BCD 110 Shimano Asymmetric Material Aluminum Defined Color Black Size 34T