Dura ace r9100 sti are lightweight thanks to carbon fibre lever blades carbon composite bracket body and a titanium clamp band fixing bolt shift cables routed under the bar tape using polymer coated inner wires make for a smooth shift action providing faster lighter shifting vivid index shifting with short stroke to the release levers gives a quick and accurate shift gear shift cables can either be routed round the front or rear of the handlebar to suit all rider preferences ergonomic