Yesterday, we had the rear tires changed on the Mh. The new Michelins 275x80x22.5. The old GY670s had no checks and the rubber was as supple as the day they were put on, with just some road dirt on ...
Always ask the tire dealer how much credit they will give you for your old tires. I usually get anywhere from $75-$125 per tire. Be aware that some dealers will charge you a "tire disposal fee" and then make additional money by selling your old tires. Some States require the tire disposal fee but your dealer can offset it will a credit for your tires. I have never failed to get a credit for my old tires that are still serviceable.