Vision TriMax 4D Compact Handlebar 31.8 x 440mm +10 ACR. The Vision TriMax 4D Compact Handlebar blends aerodynamic shaping with ergonomic comfort for road and triathlon riders. Its 4D design encourages a natural wrist angle while the compact drop and reach support multiple hand positions. Constructed from carbon fiber it offers a lightweight vibration-damping ride ideal for long-distance efforts and high-speed control.