[DutchmenSport]

As long as they are holding air pressure, as long as they are not dry-wall cracking, as long as they still have acceptable tread, as long as they don't have any cuts, tears, holes, nails, or tacks in the tread, you don't need to change them.

I got over 50,000 miles on my original factory installed tires on my current truck (signature below), and replaced tires then because I skidded the side of one and tore it (rear outside tire). With the mileage, and to keep all the tires equal, I replaced them all.

I've since put about 40,000 miles on the second set, and those tires are still good, no problems at all. Every time I take the truck in for an oil change and service, I ask the techs to inspect the tires thoroughly. They do. I've never had problems. Oil Changes are every 5000 miles.

If they aren't broke, why fix it?

Of course, I don't purchase on-sale, or discounted tires either. I pay the price. That set of 6 tires cost me about $2000.