With a low speed tractor tire, repairs seem to last longer, not as much stress on the tire as would be on a highway tire. I had a tire with a 3/4" hole in it, so I put a 3/4" bolt through it, ground down corners of the bolt (on the outside), put a big patch on the inside, then a fender washer, then a 1/2 thickness nylon jam nut, then a blowout patch, then a chafer tube, then a regular tube, repair worked for 5 years, then sold the tractor, it was still holding air! Had a hillbilly neighbor that patched a split in a JD B rear tire with 2 pieces of steel with 2 holes drilled through them, 2 bolts held it together for 15 years or more, but you could hear him coming down the road for a couple of miles, pop-pop-clank, pop-pop-clank, etc!