How often should you change your tires?

you can get a tire shop to measure the tread depth and they can let you no or if they are all cracked your tires should be rotated every 3000 miles (along with oil change). tires should be replaced if tread is less than 3/32nds of an inch deep. should not be used util tire is bald. if tires have been stored a long period of time check them for cracked rubber. Use your discretion , if unsure, ask a tire dealer. They will look at them for you and give you the best advice.