Shimano dura ace r9100 11 speed groupset buildershimanos dura ace r9100 11 speed groupset is favoured by most of the teams in the pro peloton and is the pinnacle of shimanos mechanical range it has been re engineered for optimal weight savings maximum energy output and minimal friction all the components work seamlessly together to give you the edge on race day use our start below button to create the perfect dura ace r9100 11 speed groupset with your preferred mix of ratios and sizes