Don’t maintain Polyurethane (PU) tires for wheelbarrow and hand truck.
Any avid gardener with a good size yard likely has a wheelbarrow or a hand-cart. The tires on smaller wheel-barrows and carts are usually PU foam tires. No maintenance is needed for these types of tires, and they rarely wear out before the equipment breaks. Since most wheelbarrows have only one PU tire, the condition of the tire and wheel assembly is very important to proper operation. In fact, if you maintain your wheelbarrow, it can last for many decades.
A common size system for wheelbarrow and hand-cart PU tires are 2 numbers, separated by a hyphen. The size could also be a series of 3 numbers separated by an “X” or a “/”. The two most common sizes are 4.00 – 8 and 4.80-8. The first number is the height of the PU tire sidewall, and the second number is the rim diameter. To get the overall diameter you need to do some math! 8 (rim diameter) + 4.00 (sidewall height) X 2 = 16 inches total diameter.