I put these tires on front of my Cat backhoe 10 months ago, after the last tires were destroyed by a rock in the second week. They were foamed so I managed to bolt them together and get 10 more months out of them. These Astros are now that old, I am in severe rock in the mountains in southern Arizona and these tires have most all the tread left, they do have a few cut up lugs but are doing a great job, these are also foam-filled. I am going to purchase the equivalent tire for the rear as I am tired fixing the rear tires with rock punctures. I do have the rear tires loaded with about 65 gallons of water and antifreeze and I will load the new tires when I put them on. I strongly recommend these tires if you are working someplace besides on the pavement, I know they are a little costly, but so is down-time.