Absoluteblack winter oval road 4 bolt road chainringabsoluteblacks winter oval road 4 bolt road chainring is designed for training and all round riding it is compatible with shimano 2x11 speed cranks like dura ace 9000 ultegra 6800 105 5800 and others it offers the performance of the genuine shimano part for a lower price features materialcnc machined 7075 txxx aluminium speed 11 long lasting construction compatibility shimano dura ace 9000 ultegra 6800 shimano 105 5800 tiagra 4700