Absoluteblack premium shimano 1104 bolt pattern oval chainrings are designed for new shimano cranks like dura ace 9000 ultegra 6800 shimano 5800 and others this is shift able chainring for 2x cranks key features cnc machined 7075 txxx aluminium long lasting construction if you are removing original shimano 4 bolt chainrings you will need cover bolts or the rotor standard road double 4 bolt set to fit absoluteblack or rotor 4 bolt chainrings compatibility shimano dura ace 9000 u