Excuse me, what's the difference between four-wheel alignment, balance and tire changing before and after?

Four-wheel alignment is to adjust the toe of the vehicle. Generally, the vehicle runs off course or the tires are abnormally worn, that is, there are faults of "eating tires" and "gnawing tires", so four-wheel positioning is needed, and there are also faults of vehicle running off course that require four-wheel positioning.

Tire dynamic balance is to adjust the balance of the tire in the process of rotation. Generally, tire dynamic balance is needed when changing tires or the steering wheel vibrates at high speed.

Four-wheel rotation is to make the tire wear evenly and prolong its service life, so it is necessary to do four-wheel rotation. Generally, four-wheel rotation is done every two weeks or so.