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I was washing my car today and noticed that my tires are bald on the inside....and I don't know why. I have a Mazda tribute, which I bought new, with almost 30,000 miles on it.  I have always taken it to the dealer for proper maintenance.....oil changes, tire rotation, etc and not once has the dealership mentioned anything about my tires being bad, as a matter of fact they have check them off on their report as being good. I don't drive the car hard....I only put about 8,000 miles per year on it.... so what gives ??  

You've posted on other web sites and will likely get a variety of answers as the postings have different information on them.

But I've said before, you have an alignment problem and somewhere in the 30K something happened to cause the car to go out of alignment.