Several ways: is your steering wheel straight when you are driving? Does your car pull to one side? Does your steering wheel vibrate? Do you notice uneven tire wear? Does your steering feel loose, or is it difficult to control? Use this guide to inspect your tires.
Check your tires periodically. A number of different things can affect your tires - from alignment to suspension components to improper inflation of tires. If you recognize any of these symptoms, bring your car in for a free inspection.