I bought my truck in 2006 with 18,000 miles on it. It still had the factory Goodyear wranglers 275/60/R20 on it. Around 40,000 i felt a small vibration. it got worse as a few months went by. When i was around 43000 it was bad. I found out that 3 out of the 4 tires had broken belts in them. I went to prince tire in goldsboro nc and they gave me a discount on a new set of the same tires. Now 88,000 mile later i have the same problem. Good thing i found a set of good used tires with 10,000 on them on craigslist for $100.