Our training shimano 1104bolt pattern oval chainrings are designed for new shimano cranks like dura ace 9000 ultegra 6800 shimano 5800 and others key features cnc machined 7075 txxx aluminum long lasting construction this is shift able chainring for 2x cranks 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 if changing the inner ring only then use the exi