There are some tire problems, such as worn or uneven tread, that require your addressing the issue as soon as possible. However, there’s another class of tire problems that demand immediate replacement of the tire with a spare, or risk a blowout. If you should ever notice one of these three problems, count yourself lucky to have noticed it before it caused a crash: A Tire With a Bulge or Bubble A bulge or a bubble on the sidewall of your tire indicates a weak area that’s yielding to the.