LVWA Carbon fiber flat MTB Bike Handlebar HB016L This bar satisfies even the most demanding riders with a massively stiff handlebar that's clip-on compatible and weighs just 150 g. To get there, we started out by keeping more than 60 percent of the bar width at the same 31.8 mm diameter as the clamp area. Then we strategically redesigned the carbon-laminate structure, adding strength around the clamp to handle clip-on extensions and stiffness to handle sprinting loads. Despite its stout characteristics, the bar cuts no corners in terms of ride quality.