ENVE Composites M9 Mountain Handlebar - 810mm 50mm rise 31.8 8/4 deg BlackENVE Composites M9 Mountain Handlebar 810mm 50mm rise 31. 8 8 4 deg Black. The M9 bar is a dedicated downhill option. Designed around a 31. 8mm clamp diameter and downhill focused flex profile this bars celebrated ride feel defined the potential of a DH carbon fiber bar and realigned performance expectations. Carbon fiber bar has a downhill focused flex profile Tuned to deliver confidence and control on the toughest tracks The M9 bar features a trail