Let us come to you for tire mounting and balancing. A tire is considered balanced when its center of gravity is exactly the same as the axis of rotation. It implies that the mass of the wheel and the mass of the tire are equally distributed along the axle, to avoid any vibration caused by the tire spinning.
A clear sign of unbalanced tires is vibration. If you feel that your car vibrates when you get to 45 mph and get worse as you increase your speed, your tires are most likely out of balance and you must ask for a tire balancing service.
A constant vibration feeling can be extremely annoying but the most important consequence of unbalance is that your tires will wear out faster, as well as most suspension components.