Tire balancing is done in house with our state of the art Hunter high speed wheel balancer. Rims and tires need to be evenly balanced due to the fact that they are a completely equal circle spinning in one constant direction. If the weight is off on any given part of the rotating rim and tire it can cause a wobble/vibration while driving. Most commonly this happens at certain speeds where the wheel starts to hop from having unbalanced weight in motion. Sometimes this will occur at one speed say 45, and then fade once you reach 50. It causes a discomfort for the vehicle occupants, but can also cause wear on steering/suspension components since it is stressing the parts that the actual wheel bolts on to. Wheel balance can be thrown off by many variants including; Tire Wear, Rust/Corrosion, Pot Holes, Weights Coming Off. Having a set of four tires balanced while they are off of the vehicle for a rotation is never a bad idea.