How to Measure the Size of the Wheels?

Many people often only know that the original wheels are “roughly the same” when replacing the casters, but when it comes to purchasing and installing, they realize that the wrong size can cause many problems. The wheels are too small, with insufficient load-bearing capacity and passability; The size is too large and may not fit the equipment. So, learning to measure the size of the casters correctly is a crucial step before selecting.
1. What are the main parameters that determine the size of the casters?
When measuring casters, it is usually important to focus on three basic dimensions: wheel diameter, wheel width, and installation height. These three parameters determine whether the wheels can be installed with the equipment, and also affect the subsequent load-bearing, smooth movement, and overall height.
Wheel diameter refers to the diameter of a wheel, which is the large distance from one side of the wheel surface to the other. The larger the wheel diameter, the better the passability and the easier it is to push. Wheel width refers to the width of the wheel or the installation width corresponding to the bracket. It will affect the grounding area and stability of the wheels. The installation height refers to the total height from the installation surface to the bottom wheel surface, which directly affects the height of the equipment above the ground and the smoothness of use.
2. How to measure the size of the wheels?
Measure the wheel diameter first. When measuring, you can use a tape measure or caliper to measure from one side of the outer wheel to the other, and take the larger value. To avoid errors, the measuring tool should be kept as perpendicular to the wheel as possible and not measured at an angle.
Measure the wheel width again. This size usually measures the actual width of the wheel, or the width of the bracket or mounting plate according to installation requirements. When measuring, aim at the edges on both sides and try to keep them parallel as much as possible, so that the data will be more accurate.
Post test installation height. This size is not measured to the center of the wheel, but vertically from the installation surface of the equipment to the bottom of the wheel. Many people are prone to making mistakes here. If they only measure the wheels themselves, there may be issues with improper height after installation.
3. What are the details to pay attention to when measuring?
Measure while the device is flat. If the installation surface itself is inclined or the ground is uneven, the measured data may have significant deviations.
Secondly, it is recommended to test at least twice, especially when the old wheels are worn out, as there may be differences in data at different positions. Combine the original specifications or installation hole positions to make a judgment.
Thirdly, in addition to the wheels themselves, attention should also be paid to the installation method. For example, tablet installation, screw installation, and plug-in installation have different size requirements. Only measuring the wheel diameter and ignoring the installation structure may still result in failure to install it later.

4. What should be considered when choosing casters?
Size is just a step, and when selecting, it is necessary to comprehensively judge based on load-bearing capacity, ground conditions, and frequency of use.
If the equipment itself is relatively heavy or frequently moves under full load, priority should be given to wheels with higher load-bearing capacity, and larger wheel diameters should be appropriately selected. This is not only safer, but also easier to push.
If the equipment requires frequent turning, such as hand carts, tool carts, mobile devices, etc., attention should be paid to the flexibility and turning structure of the casters to avoid focusing only on size and neglecting the user experience.
If the usage environment requires high ground protection such as ceramic tiles, epoxy flooring, wooden flooring, etc., attention should also be paid to the wheel surface material. Polyurethane, TPR and other materials are usually more suitable for indoor use, while hard materials such as nylon are more suitable for heavy-duty or industrial environments.
5. A brief summary
Measuring the size of casters is not complicated, the key is to accurately measure the core parameters of wheel diameter, wheel width, and installation height, and confirm them together with the installation method. Only when the size is appropriate, the load-bearing capacity matches, and the material is selected correctly, can the casters be more stable and durable in practical use.
If replacing the old wheels, it is recommended to record the size, installation method, and usage scenario of the old wheels together, and then compare them with the new product selection, which is less likely to make mistakes.