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# When to balance tires

## New Tires Only Solve Part Of A Problem

Tire balancing and alignment can be expensive, but ofte. Tire balancing and alignment can be expensive, but often is necessary (Corbis).

During my years at the service counter costumers who purchased tires often asked me, “Do I have to have them balanced?” followed by, “Does it need an alignment too?”

I understand why consumers ask these questions. Tire balancing coupled with wheel alignment can be expensive. So let’s look at why balancing new tires and performing a wheel alignment are necessary.

Tire balancing

Despite advanced tire manufacturing processes and advanced rubber compounds used today, some weight imbalance can still be evident in new tires. Therefore they should be balanced with wheel weights to achieve smooth rolling of the tire. An imbalanced tire expresses itself as a wheel shimmy (rocking back and forth of the steering wheel while driving, usually at a specific speed).

To balance a tire, it must first be mounted in the proper rim and then inflated to the proper air pressure and a new valve stem installed. Next, the complete tire/wheel assembly is affixed to a machine that is designed to spin the tire and identify the location and severity of the imbalance. The tech must then affix the proper weight to the rim in the location designated by the machine. Finally, the wheel is spun again to ensure that the tire is properly balanced. A tire is balanced based on the mass of rubber present at the time of its first balance. As the tire rolls down the road, rubber wears off, causing the tire to become imbalanced again. For this reason, when tires are rotated on the vehicle every 5-6,000 miles or 6 months, they should be checked and rebalanced if necessary.

Wheel alignment

The average price of a newly mounted and balanced tire with a new valve stem is roughly \$125 per tire. That’s \$500 for the set of four. If your wheel alignment is out, you could lose that \$500 in short order. That’s why you should, at the very least, check wheel alignment before venturing out on a new set of tires.

So how could you lose money by not having an alignment done? By significantly decreasing the life of your new tires. The steering and suspension of your vehicle has wear points. They are bushings, ball & socket joints, and miscellaneous mechanical links. When the steering and suspension system is new and adjusted according to factory specs, the rate at which the tires wear is minimized and the vehicle corners and handles smoothly. Over time, the steering and suspension systems are jostled and hammered (compliments of America’s highways). This produces wear in the parts listed above, causing the alignment to go out from factory specs. This results in poor cornering and

handling, and a significant increase in tire wear.

There are three alignment angles that must be in line for the vehicle to handle properly and for minimal tire wear. Carmakers have built adjustment points into the steering and suspension that allow for re-alignment of the front end.

There are three alignment angles:

Camber is the angle of wheel alignment that measures the tilting in or out in reference to the top of the tire. If a car’s camber angle on a tire is too positive then the top of the tire is tilting outward. If the camber angle is too negative then the top of the tire is tilting inward. This angle is adjusted mechanically. Conditions that cause excessive camber are worn ball joints, control arm bushings, strut bearings/mounts, or excessively worn wheel bearings. These parts must be ‘tight’ (not sloppy) to insure accurate alignment of the camber angle.