... tire,also called pu wheel , flat free wheel . American Technology , High quality , light to handle .now suggest one size 4.80/4.00 ... -8hole diameter = 12mm Width = 4" Load Capacity = 500 lbs tyre ... sizes including : 200x50,265x85, 3.50-4,3.50-6, 4.00-6, 3.50-8,300-8,325 ... 250-4,500-6, 6.50-8 etcwelcome e-mail us for much more details . flat free tire 4.00-8 ...