In many people’s minds, whether a caster is quiet depends solely on the material of its wheel.

As a result, during the procurement process, you often hear requests like this:

“We need silent casters.”

However, once put into actual use, it became apparent that even identical silent wheels exhibit significantly varying performance across different factories and equipment.

Some push with almost no sound; others, however, produce a continuous rolling noise and vibrations, and even emit unusual creaking or squeaking sounds when turning.

This illustrates one point: The noise generated by casters is not caused by a single factor.

What truly determines the level of noise reduction is the entire mobile system, comprising casters, equipment, and the operating environment.

Where exactly is the noise coming from?

Many people believe that all sounds are produced by wheels.

In fact, four distinct types of sounds may be generated during movement:

• The rolling sound of the wheel tread against the ground;
• Friction noise during steering of the universal joint assembly;
• Abnormal noise generated by bearing rotation;
• Resonance noise generated by equipment vibration.

In other words, hearing a noise doesn’t necessarily mean there’s something wrong with the wheel.

Only by first identifying the source of the sound can you truly pinpoint the cause.

Type 1 noise: the contact sound between the wheel tread and the road surface.

This is the most common type.

With each rotation, the caster remains in continuous contact with the ground.

If the ground is relatively rough or contains particles and joints, continuous minor impacts will occur during rolling.

The same caster can produce vastly different sounds on an epoxy floor versus a rough concrete surface.

Therefore, in many cases, it is the floor that changes, not the casters.

Second type of noise: the amplification effect caused by equipment vibration.

Many companies have found, after replacing their casters:

The wheels are perfectly quiet, yet the equipment is still very loud.

The cause may not lie with the casters.

If the equipment’s base frame lacks sufficient rigidity or has a high center of gravity, vibrations generated when the casters encounter minor unevenness will be amplified and transmitted through the equipment.

The sound ultimately heard actually comes from the device itself.

This is also why the same caster, when mounted on different equipment, exhibits markedly different levels of quietness.

Third type of noise: the sound emitted by the universal joint mechanism.

If unusual noises occur only when turning, the universal joint assembly should be inspected thoroughly.

For example:

• Dust enters the turntable;
• Long-term lack of cleanliness;
• The mounting component is loose;
• Long-term, high-frequency steering.

All these factors can affect the rotation of the universal joint, resulting in friction or impact noises during steering.

Many users mistakenly think the wheel is broken, when in fact what really needs to be inspected is the turntable mechanism.

Fourth type of noise: changes in bearing condition

Bearings ensure that wheels rotate smoothly.

When dust or foreign debris enters the bearing, or after prolonged wear, rolling resistance increases.

At this point, the following may occur:

• The sound of “shasha”;
• “Squeaking” sound;
• A persistent rubbing sound.

If you continue to use it, not only will the noise become increasingly noticeable, but it may also compromise operational efficiency.

Therefore, bearing condition should also be included in routine inspections.

Why are new casters so quiet, but become increasingly noisy over time?

This is a problem that many companies face.

In fact, as usage time increases, the factors contributing to noise gradually accumulate.

For example:

• Wheel tread wear;
• Oil or particulate contamination on the ground;
• Dust accumulation in the universal joint;
• Bolt loosening;
• The equipment base frame is slightly deformed.

These changes may seem insignificant on their own, but when combined, they make the device increasingly noisy.

Therefore, noise reduction depends not only on product design but also on subsequent maintenance.

How can caster wheel operating noise be reduced?

If you want your device to maintain excellent quiet performance over the long term, you can start by addressing the following aspects.

Choose wheel materials that match the ground conditions.
Different materials are suited to different flooring surfaces; only by matching the operating conditions can you achieve a balance of quiet operation, wear resistance, and rolling performance.

Keep the operating route tidy.
Promptly remove debris such as sand grains and metal fragments to minimize impact on the wheel surface.

Regularly inspect the universal joint assembly and bearings.
When unusual noises are detected, don’t focus solely on the wheel surface—be sure to inspect the internal rotating components as well.

Check the device connection status.
Bolt loosening and increased gaps in the mounting brackets can both amplify vibrations into noise.

Avoid prolonged overloading.
Continuous operation under high load not only shortens the service life but also tends to increase rolling noise.

A common procurement misconception that’s easy to overlook

Many purchasers believe:

“Silent casters are completely silent.”

In fact, casters can only reduce operating noise; they cannot eliminate it entirely.

The actual noise‑reduction performance is also influenced by a variety of factors, including the device’s weight, its speed of movement, the type of flooring, and the operating environment.

Therefore, when making a purchase, one should not focus solely on whether the equipment is silent; instead, it is essential to consider wheel material, structural design, and operating environment in conjunction with the actual working conditions.

Written at the end

Caster noise is more than just a matter of comfort.

In many cases, it also serves as an indicator of changes in the device’s status.

When the casters start to get increasingly noisy, rather than rushing to replace them, it’s best to first identify where the noise is coming from.

Because what really needs to be maintained may not be the wheels themselves, but the entire mobility system.

For industrial equipment, Quiet operation not only ensures a better working environment but also achieves a more optimal balance between casters, equipment, and the floor.

What type of caster noise is most common in your facility—rolling noise, steering noise, or equipment resonance? Feel free to share your on-site experience in the comments or by contacting us; we’ll continue to delve into more technical details of caster applications in future content.