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TOE ALIGNMENT
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Welcome!
Thank you for your interest in our site. We do appreciate you bringing your car question for answer.Because every situation and circumstance is unique, the answer to your question may require a different answer or explanation. I believe that your answer lies at this website.

TOE ALIGNMENT

Toe is the most important wheel alignment angle because it has the greatest effect on tire wear. Toe refers to the parallelism between the wheels as viewed from above and is usually measured in inches or millimeters. When both front wheels are aimed straight ahead and the distance between the leading edges of both front tires is exactly the same as the distance between the trailing edges, the wheels have "zero toe" and are theoretically aligned. We say in theory because toe alignment changes when the vehicle is being driven.The joints and sockets in the suspension and steering linkage all have a little play, which when added together can allow wheel alignment to change depending on how the steering and suspension are loaded. Likewise, the rubber bushings in the control arms have some compliance and deflect slightly when the vehicle accelerates, brakes, turns and cruises. This too can allow toe alignment to change. To compensate, a little bit of "toe-in" or "toe-out" may be added when the wheels are aligned depending on whether the vehicle has front- or rear-wheel drive

Toe-in means the front edges of the tires are closer together than the rear edges. Most rear-wheel drive cars and trucks have alignment specifications that call for a little bit of toe-in (say 1/16th of an inch or so). This will produce zero rolling toe as the vehicle is being driven down the road because the natural tendency for the front and rear wheels is to toe-out due to rolling resistance and compliance in the steering and suspension.

Toe-out is when the front edges of the tires are farther apart than the rear edges. This may occur if the tie rod ends are worn, or if the control arm bushings have collapsed. Toe-out is a bad condition to have because it causes the tires to scrub as they roll along. Only 1/8th inch of toe-out will scrub the tires sideways 28 feet for every mile driven. At this rate, it doesn't take long to wear down the tread.

A classic symptom of toe misalignment is a feathered wear pattern across both front tires. The direction of the feathering tells you if the tires are toed-in or toed-out (rough edges towards the inside signal toe-in while rough edges to the outside indicate toe-out). But on radial tires, toe misalignment tends to roll the shoulder of the tire under as it scrubs producing wear on the inner or outer ribs only. Toe-in will wear the outer rib while toe-out will cause wear on the inner rib. In both instances, wear can be aggravated even more if the tires are underinflated.

Replacing the tires may replace the worn rubber, but it won't eliminate the tire wear problem. The new tires will suffer the same fate unless the cause of the misalignment is identified and toe is reset to specifications. So anytime the tires show toe wear, toe alignment should be checked to see if it is out of range. Also, the steering should be inspected for worn or bent parts. In addition to checking for loose or worn tie rod ends, look for bent steering arms or tie rods because either can cause toe wear, too.

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It is always a good idea to have your car aligned after working on any of the main suspension components as the car geometry has been changed. A good idea would be to take it to a tyre centre and have the wheels balanced, camber adjusted and front end aligned al together. 4WD cars like the Subaru Impreza require four wheel alignment. Check the inside of the front tyres in your car for excessive wear, rounding, unusual tread wear etc