What does a bad motorcycle wheel bearing sound like?

Typically a rumble, growl or hum that changes with road speed, sometimes with a clicking or grinding as it gets worse. The noise usually does not change with engine RPM.

How long do motorcycle wheel bearings last?

There is no set mileage. Life depends on seal condition, water and dirt exposure, pressure washing, load and wheel work. Many last a long time, and others fail early after water gets in.

Can I ride with a bad wheel bearing?

It is not safe to keep riding on one. A failing bearing can overheat, seize or let the wheel wobble, so get it checked promptly and stop riding if the wheel has play or the noise is getting worse.

Should wheel bearings be replaced in pairs?

Usually the bearings in the same wheel are replaced together, since they have seen the same wear and water exposure. A shop can tell you whether to replace the seals and spacer too.

Motorcycle wheel bearings: signs, checks and replacement

Motorcycle wheel bearings are small steel ball bearings pressed into the wheel hub that let the wheel spin smoothly on the axle. A bad one usually shows up as a rumble or growl that rises with road speed, play when you wiggle the wheel, or a rough, notchy feel when you spin it by hand. If you suspect a failing bearing, it is a safety item, so inspect it soon and do not keep riding on it.

Here is what they do, how to check them and what replacement involves.

What wheel bearings do

Each wheel rides on bearings that sit in the hub, one on each side in many designs, with a spacer between them. They carry the weight of the bike and the forces from cornering and braking while allowing the wheel to turn with little friction. Ball bearings are rolling-element bearings that use balls between inner and outer rings to reduce sliding friction, and wheel bearings handle both radial loads (weight pushing down) and axial loads (side forces in corners).

Most motorcycle wheel bearings are sealed. The seals keep dirt and water out and grease in, which is why they usually need no maintenance. When a seal fails, water and grit get in, the grease washes or dries out, and the bearing starts to wear.

Symptoms of a bad motorcycle wheel bearing

Bearings fail gradually, so the signs can be subtle at first.

Rumble or growl that follows road speed. It often gets louder in corners as the load shifts to one side.
Humming or whirring that stays when you pull in the clutch and coast, and changes only with road speed.
Play in the wheel. With the wheel off the ground, grab it and rock it side to side or in and out.
A rough or gritty feel when you spin the wheel by hand with the bike supported.
A wheel that does not spin freely, or that spins with a catch.
Vibration or wobble at speed.
Heat at the hub after a ride, if a bearing is binding.
Grease or rust stains around the seal.

A bearing noise differs from engine or chain noise because it follows road speed, not RPM. A loose chain, a worn tire or a dragging brake can also cause noises, so rule those out. Our guide to motorcycle chain noise and brakes dragging can help.

How to check wheel bearings

Make sure the bike is stable on a stand with the wheel off the ground. Use the right stand for your bike and do not rely on a side stand for this.

Check for play. Grip the tire at the top and bottom, then push and pull. Do the same side to side. Any clunk or movement at the hub can point to a worn bearing, but also check the axle nut, steering head and swingarm bearings, which can feel similar. If the clunk shows up mainly when you brake, see motorcycle front end clunk when braking.
Spin the wheel. It should turn smoothly and quietly and coast down gradually. Roughness, grinding or a rough spot is a warning sign.
Check the brakes. A dragging brake can mimic a tight bearing. Take pressure off the lever and see if the wheel is still stiff.
Look at the seals. Damaged seals, rust or dried grease mean the bearing may be compromised.
Remove the wheel for a better look, if you know how, and spin the bearing by hand. A good bearing turns smoothly with no gritty feel.

Front wheel play can also come from the steering head. Our guide on motorcycle steering head bearings explains how to tell the difference.

Causes of wheel bearing failure

Cause	What happens	How to reduce the risk
Water intrusion	Washes out grease and rusts the bearing	Avoid aiming a pressure washer at the hubs
Failed seals	Dirt and moisture get in	Inspect seals when changing tires
Impact	Potholes and curb hits damage the races	Replace if the wheel took a hard hit
Improper installation	Bearings pressed in crooked or struck incorrectly	Use proper tools or have a shop do it
Over-tightened axle or wrong spacer	Preloads the bearing	Follow the manual for axle tightening
Age and mileage	Grease breaks down, surfaces wear	Check at tire changes
Contaminated grease	Wear from grit	Replace the bearing

Wheel bearings and tire changes

Tire changes are the perfect time to check wheel bearings, since the wheel is off the bike. Spin each bearing and look at the seals. A tire shop or a motorcycle tire shop can often spot play and roughness, and replacing a bearing during the tire job can save labor. Our guide to how to choose motorcycle tires covers the tire side, and motorcycle tire replacement cost gives pricing context.

Which wheel bearings are right for my motorcycle?

Bearings are cheap compared to what they protect, but fitment matters.

Match the exact size and type for your wheel. Look up the bearing set by year, make, model and which wheel (front or rear). Do not guess based on how the old one looks.
Use a quality bearing set. Look for known brands that list your bike. For guidance on quality, see our guide to OEM vs aftermarket motorcycle parts.
Replace seals, spacers and circlips as needed. A new bearing in a damaged seal will fail again.
Check the bearing seats. If the bore is worn or damaged, a new bearing may not hold.
Do the whole wheel. Replace the bearings on each side of the hub together.
Check sprocket carrier and rear hub bearings. On chain-driven bikes, the rear sprocket carrier has its own bearing that can wear out too.

Replacing wheel bearings

Replacement is a job for a shop or an experienced home mechanic. The old bearings must be removed without damaging the hub, and the new ones must be pressed in evenly by their outer race. Hammering on the wrong part ruins the bearing or the hub. Use the tightening values in your manual for the axle and any retaining parts, and never guess at them.

Common mistakes:

Driving the bearing in by the inner race
Leaving out the spacer or installing it wrong
Reusing damaged seals
Under- or over-tightening the axle
Not checking the brake disc and sprocket bolts afterward
Pushing a bearing in crooked

After the job, spin the wheel, check for drag and make sure the brake caliper and chain alignment are correct.

Cost

Costs vary by bike, region and shop. As a rough range, a set of bearings for one wheel often costs from about $15 to $80 for parts, with seals and specialty kits costing more. Shop labor for one wheel is often an hour or two, though a tire change or damaged hub can raise the total. See our guide to typical motorcycle repair costs for general pricing.

When to see a mechanic

A failed wheel bearing can lock or collapse the wheel, which is dangerous. A shop that does motorcycle maintenance can inspect and replace bearings, and you can find a motorcycle mechanic near you. See a professional if:

The wheel has play at the hub
You hear a growl or rumble that follows road speed
The wheel feels rough, tight or binds when spun
The hub is hot after a ride
The bike wobbles or vibrates at speed
The wheel hit a pothole or curb hard
You do not have the press tools or manual specs

If you suspect a bearing is failing, get it inspected before you ride further, and stop riding entirely if the wheel has play, binds or the noise is getting worse. A bearing that is allowed to fail can damage the axle, hub and brake parts, which costs far more than catching it early.