I have to agree with DieselMonk. Those tires go for years with chunks missing. You wouldn't believe the tires on my personal tractors. I just replaced one pair a few years ago because they were 2 different sizes and I had a nicer set that I could put on it. One of the old ones had several lugs completely gone. And it had a hole so big the tube was coming out. I put a piece of tire in it to cover the hole and bolted it in, and drove it that way for a couple years. It's still out in the field on the rim and I could probably still use it. One of my other tractors has one tire where the entire tread is breaking loose from the tire. There is a big crack the whole way around the tire. Been that way for years and it's still going. The thing with tractors is, they don't go down the interstate at 70 mph. A flat tire isn't a really big deal.