Insert curse words here __________!!!!!!!!!!! My tires up front are 11x4-5 and they are just too dang small period. Either that or the rims suck. I am so sick and tired of getting flats up front. I'm not talking puncture flats, I'm talking knocking the tire off the rim. Once the bead breaks, the tire is totally flat and off the rim it's impossible to get it to seal and take air. I used to be able to get them to catch. But not anymore. Now every time they pop off it requires a trip to the tire store. They have those things that deliver a short burst of air that blows the tire back on the rim. What a friggin pain! Oh and yeah you guessed it, seems I always have it happen after 5 pm when all the tire stores are closed. I thought about getting those zero flat tires to replace these. But I figured they would ride lousy. I think the real answer to this 13x6.5-6 or larger front castors or am I wrong? Is it my tire size? My rims? Or does everyone have this problem?