Vision Metron 81 TL Front Wheel 21H 700c TL DB CL TA12. The Vision Metron 81 TL Front Wheel is engineered for aerodynamic dominance in road racing and triathlon settings. With its deep carbon rim profile and tubeless-ready design it delivers exceptional speed and stability at high velocities. Ideal for time trials and flat courses this front wheel offers a responsive ride and reduced drag helping riders maintain momentum with less effort.