When I purchased the TT I have now a few years ago it had the original tires on it. They were 17 years old. Boy, did they look bad. The TT salesman tried to tell me they were good yet. Never believe a salesman. I towed it the 10 miles home and the 4 miles to the tire shop the next day and had new ones installed. I never go more them 70 miles from home and the TT sets inside a shed so I will probably not change them at the 5 year interval as recommended.