Actually, don’t do just one, check all four wheel’s for alignment, to be absolutely specific. (which we have to do sometimes) You should have your car’s wheel alignment checked every 30,000 miles, or as often as your owner’s manual suggests. But, as I believe we’ve noted here before, people aren’t always interested in their owner’s manuals, so we’ll just go ahead and say – check it every 30,000 miles. Oh! And also have your wheels re-aligned any time your purchase new tires whether it’s one or all four. Checking your wheel alignment actually means that you’re checking your car’s suspension and how your tires sit within that suspension. Aligning them means that you’re setting them straight, the way they’re supposed to be. When your wheels aren’t aligned, it will shorten the life of your tires and cause poor handling; your car will pull to one side or the other, or the steering wheel will shake. It’s annoying, and bad for your car too.