Lightweight and strong 6066 aluminium road racing drop handlebar, for oversized 31.8 mm clamp diameter 6066 aluminium is a high strength aluminium alloy commonly used in the aircraft industry making it the ideal choice to produce this lightweight, strong and rigid handlebar Oversized 31.8 mm clamp diameter reduces unwanted flex under high load by increasing strength and rigidity For further rigidity the 31.8 mm diameter is carried across the top of the bar, keeping the strength where it is needed and reducing the wall thickness where vital grams can be saved Internal cable routing options for Di2 cables Dual recessed groove cable routing Weight from 245 grams