For stem swivel casters, the larger diameter is, the more effort of promote and the better of obstacle. Owing to the first casters in the West in the 19th century, the casters are indicated in inches. Even in China. There are mostly 5-inch , 4-inch casters in China's supermarket trolleys. The current market size of the popular casters from 1 inch to 10 inches have, which is commonly used in the size of 2 inch, 2.5 inch, 3 inch, 3.5 inch, 4 inch, 5 inch, 6 inch, 8 inch, 10 inch, etc.
If the equipment need to promote, such as the supermarket shopping cart, logistics trolleys, tool vehicles, such as the use of 4 to 6 inch casters better. However, the diameter of the removable caster wheels is too large will increase the center of gravity equipment, the cost increase, so you need consider all aspects. If the equipment does not require frequent promotion, such as furniture, refrigerators, etc., only when engaged in hygiene need to move about, use the following 3-inch casters can be.