Absoluteblack training shimano 1104bolt pattern oval chainrings are designed for new shimano cranks like dura ace 9000 ultegra 6800 shimano 5800 and others this is a 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