I am building a go kart for a school project and cannot figure out what size tires will for my rims. My rims are three piece 5" margay rims and they came with 11x7.00-5 Burris racing tires for the rear setup. I couldn't get on of the tires off of the rim even though I had already taken the rim completely apart. The tire just wouldn't unseat itself no matter how hard I tried so it eventually ended up being cut off with a razor knife. Now that I'm in need of a rear tire I can't find the same tire for cheaper than 65$ and I'm on a bit of a budget. I was wondering what sizes would fit, like would a 13x6-5 fit or would it be too narrow for the rim? If you know of any sizes that would for sure fit that would be a great help and I need to know ASAP. Much thanks - DHarrah.