I have been to a lot of car shows over the years, both as a spectator and a participant. I love the cars that have been fastidiously restored as well as the ones in original, unrestored condition. The one thing that amazes me is that an owner can spend so much time keeping a car in top condition and yet, ignore the tires completely. I can't tell you how many times I have seen a pristine example of a classic car only to find ragged, worn out tires supporting it.
Not only can a tire wear out, but it can also age. Even if your tire has plenty of tread depth left it can show signs of age and need replacement. The most notable indicator that a tire is old is the presence of numerous, tiny cracks in the sidewall.
DETAIL SHOWING AGE CRACKS IN TIRE SIDEWALL
The tires used on vehicles that are driven infrequently or accumulate low annual mileage are more likely to experience cracking because long periods of parking or storage interrupt "working" the rubber. In addition to being an annoyance to show car owners, this condition often frustrates motor home and recreational vehicle owners who only take occasional trips and cannot even park their vehicle in a garage or shaded area. Using tire covers at least minimizes direct exposure to sunlight.