Read the rubber. Inspect your tires for any tears or bulges in the side wall. The tires should have a good amount of tread left. The easiest way to measure this, if you don't have a gauge, is to hold a quarter upside down in the tread. If the top of George Washington’ head is visible, you need new tires to ensure traction in all weather conditions. Make sure the tire pressures are set to the figures that are printed on the placard on the driver’s door jam, or what’s listed in your car’s owner’s manual. If you need to replace your tires, our car and truck tire Ratings will help you choose the best model.