What do you do if everything is fine but you have an alignment with your new tires and now your new tires are worn out in 10,000 miles, when the old ones lasted 60,000. My point is if it aint broke don't fix it. Like I think I already said, IMO most shops who do alignments do not do them correctly. I am not trying to ruffle feathers here, but lots of people that "do" alignments don't understand the science behind it, (including myself-but I know guys who do) and the spec. book is not right for every vehicle. A salesman with 600 lbs of books in his trunk NEEDS a different alignment than a commuter with an empty trunk, even with the exact same vehicle. A good alignment shop will ask questions about how you use the vehicle and will tailor the specs. for your specific vehicle and use. The other shops will just set it to specs. which would be wrong for many vehicles and their uses.