Wheel Balancing and Rotation

A perfectly round tire mounted on a perfectly round wheel would roll without any vibration at any speed. In reality, every tire and wheel combination has slight weight imbalances. A heavy spot as small as half an ounce creates a vibration that increases with speed. A wheel balancer spins the assembly and identifies where to place counterweights to equalize the mass distribution. A vibration felt in the steering wheel at highway speed that was not there before and started after a tire service almost always means the front wheels were not balanced correctly.

Static imbalance means the heavy spot is on one plane — the tire bounces up and down as it rotates. Dynamic imbalance means the heavy spot is off-center — the tire wobbles side to side. Modern spin balancers detect both simultaneously and place weights on both the inner and outer rim flanges to correct both types at once. Always use a dynamic balance on all four wheels.

Rotating tires moves each tire to a different position on the vehicle at regular intervals — typically every 5,000 to 7,500 miles. The purpose is to equalize wear across all four tires because front and rear tires wear differently. Front tires on a FWD vehicle wear faster because they handle driving, steering, and most of the braking simultaneously. The standard rotation pattern for non-directional tires crosses the rears to the front and moves the fronts straight back. Directional tires — tires with a tread pattern designed to rotate in only one direction — can only be swapped front to rear on the same side.