we are OEM manufacturer of pneumatic wheel including wheelbarrow wheels, hand truck wheels, wagon wheels and so on. the sizes and specifications are as follows: 16x4.80/4.00-8 16x4.00-8 14x3.50-8 13x3.25/3.00-8 13x5.00-6 15x6.00-6 13x4.00-6 12x3.50-5 11x4.00-4 10x3.50-4 10x3.00-4 8x2.50-4 200x50 6"x2"