... trolleys. Etc. (truemancorp.com)Wheel includes: pneumatic wheels, solid wheels, semi pneumatic wheels, flat free etc.Pneumatic: 200x50, 8X2.50-4, 10X3.00 ... , 8x1.75, 8x2.2, 10x2.5, 13x3, 14X4 etc.Semi pneumatic: 6-16Pu Flat free: 200x50, 2.50-4, 3.00 ...