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I have lots of problems with hawthorn thorns flattening the front tires on my Ford 641D. After fixing both tires multiple times, I had them foamed, which cost somewhat over $100 a number of years ago. When I had that done, the tires looked new, and I thought they would last as long as I would. But after about 5 years, one of the casings started tearing between the tire ribs, and eventually a huge piece of the tire broke off and was flopping around. With half of the tire ribs gone, it didn't turn worth beans, and I had to do something or not use that tractor. It was a real pain to get the solid foam "doughnut" and the remains of the tire off the rim. I worked for hours with the sawzall and prybars. The beads were especially hard to get off, and had to be done after all the foam had been removed. At least I know how to do it now. When I replaced the tire, I bought the heaviest multiple ply tire I could find in the area. And 6 months later, I started having flats again with that tire. So I put a whole quart of Slime (for tube tires) in that front tire and have only had to add air a couple of times since then. Time will tell how this works out long term, but it has been OK for more than a year. Now the other foamed tire is starting to break up between the tread ribs, so I suppose I will have to fight that one apart too. I don't think I will have tractor tires foamed again--it costs too much, there is almost no give in a foamed tire to cushion the mechanisms if you go over something, and it seems like foaming causes the tire casings to go bad earlier than they should. Maybe I had poor quality tires, but whatever, for me the experiment of foaming the tires didn't work out too well. It sure was nice not having to fix flat tires for a few years though. Good luck!
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