There are a number of different tire warranties offered by manufacturers, the most popular of which is a mileage warranty. This covers the tire in the event that it does not reach its advertised mileage. However most tire warranties will not cover sidewall damage because it is considered to be a result of normal wear and tear. However, some manufacturers may offer a limited warranty that will cover certain types of sidewall damage. It's always best to check with your manufacturer to see if your tires are covered under warranty before you have them replaced.