According to the National Highway Traffic Safety Administration (NHTSA), tire failure causes around 11,000 car crashes each year. Both Unser and NHTSA recommend doing a quick tire inspection once a month to see if you need new tires.
Tempurature changes: Tire pressure drops in extreme cold. The challenge in summer is excessive heat buildup in the tire. If you're heading out on a road trip with an underinflated tire. it will generate more heat and wear out faster.
Bulges, gouges, or cracks: When a tire deflates , it bulges at the sides. This is a sign of low tire pressure or slow air leak. If you see bulges, gouges, or cracks, take it in to your dealer and have them look at it.
Vibration: Watch out for vibration or thumping when you're driving. If it feels like it's coming from under the seats, the rear tires may be out of balance. Vibration from the steering wheel could indicate suspension issues.
Tread wear: One of the best ways to tell if you need new tires is the old-school penny test: Place a penny into the tread, with lincoln's head faced down. If you can still see the top of his noggin, the tread is dangerously low. Most modern tires, however, have wear bars: bits of rubber woven into the pattern at a specific depth.
Tire pressure: Tires deflate at a rate of about one pound per square inch per month.
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