Vision Metron 4D Flat M.A.S. Handlebar Extensions 31.8mm Clamp Diameter 420mm Width 290mm J-Bend Extensions – CarbonVision Metron 4D Flat M. A. S. Handlebar w extensions31. 8x420mm 290mm J Bend. The Vision Metron 4D Flat M. A. S. Handlebar is designed for aerodynamic efficiency and ergonomic comfort in road triathlon and time trial disciplines. Its unique 4D shaping promotes a natural wrist angle while the integrated Modular Aero System (M. A. S.) allows for fine tuned positioning. This handlebar is ideal for riders seeking a streamlined cockpit with enhanced
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