I got abflat after many hundred miles and Walmart's Bell tires are the only ones that are the right size. For some reason I keep getting slash type flats. I went through 3 tubes within a week and 2 were in the matter of 1 day. The last one which went flat the quickest was where I was 99% sure it was seated properly. It had no bulge and was relatively uniform when I spun the wheel. I put the tube in the tire and then put one bead in the rim, then put the other bead on with the inner tube inside the tire. Is Bell just a crappy brand or why do I keep getting flats so quickly. The rim and tire look like they are in great shape.