Pneumatic Wheels and Flat Free Wheels
Standard Pneumatic Wheels are typically Air Filled but provide the best ride when comparing a foam filled tire. Air filled Pneumatic wheels require more maintenance than Foam Filled but will roll easier, absorb more shock, roll over gravel, dirt, grass, and obstacles much easier. Foam Filled Wheels are filled with a micro cellular polyurethane foam, these wheels do not require maintenance but they are not meant to sit for long periods of time with weight or they will eventually flat spot once the foam sets into the wheel. The Foam Filled Wheels look identical to a pneumatic and performs very close but if performance is the requirement I would choose the air filled pneumatic over the foam filled / flat free tire. If you are looking to replace a dolly or a hand truck you will most likely need a 8" or 10" size with a 5/8" ID Ball Bearing and the wheels are normally a Offset Hub. If you are replacing a wheel barrow these typically come with a 3/4" ID bearing. If you need replacements for Casters these wheel have a Centered Hub and normally be 1/2" ID.
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