Last month my car was wearing the inside of the front right tire. A local tire service did an alignment and at the same time I swapped the right front and back tires. Now it pulled to the right. I took it back to the tire dealer today and they checked the alignment, it's OK . So for an experiment I let them swap the front tires. Now it pulls slightly to the left. It it the tires ? What happens with a tire to cause that ? They are year old X-metrics from Costco. Should I take them back ?

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David McDonald
1981 240D
1985 300D (wrecked)
1985 300TD 365,000 miles
1969 Mustang Fastback