inside shoulder of the right and left front tires scallop badly on toyota car

Only genuine dealer or exact service manual can provide you exact specs.If the outer or inner shouled tire scallop then its aliment issue.For steering to tine to rack to suspension all needs inspected.Its not safe to drive that way.

Make sure the right-front CAMBER angle is either "0" or slightly negative. Any positive setting will lean the top of the tire out and wear the shoulder on the tire.

If the right-front does have a positive camber angle, the axle should be replaced (do not bend the axle as this voids any warranty).

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Total TOE should be at "0" when loaded. Traditionally alignments have been set between 0.030” to 0.060” with 0.040” considered industry norm. However, studies show that any excessive toe-in is very penalizing to tire wear.

The rear axles should be parallel and as close to "0" thrust as possible. Normally, if an axle can not be set exactly to "0" (due to shim thicknesses) it is set to the closest possible setting to "0" but thrusting to the LEFT. This helps the truck compensate for road crown. If you have any thrust angle to the RIGHT in the drive axles, it will accentuate the effects of road crown. Then you’ll have to compensate by turning the steering tires to the left, which could result in outer shoulder wear to the right-front tire and inner shoulder wear on the left-front tire.

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Finally check the caster setting. Caster is not normally a wear issue, however, after a wreck the caster stands a chance of being grossly incorrect. Normally caster is set about 1/2-degree higher on the right than the left to compensate for road crown. The service center recommends a setting of 3-1/2 left, and 4 right. If your settings vary, caster can cause a pull in the vehicle, and that pull has to be compensated for by correcting with the steering wheel, and thus causing shoulder wear.

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we recommend having your tire inspected by a qualified tire professional.

One-sided wear, can be caused by improper camber and drive axle misalignment. Worn kingpins, improper bearing adjustment and excessive axle loads can also cause shoulder edge wear.