Just thought I would post a heads up here. I bought a bike a year ago and was only able to start riding it this March. The tires weren't new but they they still had pretty decent tread. The previous owner had the bike for about 2 years and only put about 400 miles on it. My rear tire looks fine, until you put some extra weight on it like sitting on the seat. At that point you can see multiple cracks and splits in the sidewall from dry rot I suppose. I was about 8 miles from the house at the gas station when I discovered this. I limped home at 30 mph. I won't be riding it until I get the tire replaced. I'm not sure what would happen to me if I had a blowout at interstate speeds. Glad I saw this. Check your tires, especially if you don't ride frequently.