Moog wheel bearing and hub assembly

Wheel Bearing Noise: Symptoms, How to Check and What It Costs

By Shane Allen · · Updated · 8 min read

Wheel bearing noise is usually a hum, growl or rumble that gets louder as you speed up and changes when you steer slightly left or right. If the noise gets louder when you lean the car one way, the bearing on the opposite side is usually the worn one, because that side is carrying more of the load.

Most wheel bearing and hub assemblies on our store cost $110 to $330 for the part, from Moog, Timken, SKF, ACDelco, Mevotech and more. Shop the full wheel bearings and hubs collection.

Below is what each sound means, how to find the bad corner, how to rule out tires and CV joints, and what the repair involves.

What a bad wheel bearing sounds like

Timken, which makes many of the hub assemblies we list, describes several distinct sounds. Each one points to a different kind of wear or to a part that is not the bearing at all.

What you hear or feel When it happens What it usually means
Humming, rumbling or growling Driving straight, louder when you steer slightly Worn bearing. The bad one is usually on the side opposite the direction that makes it louder.
Grinding Turning or shifting weight Damage to the rollers or races inside the bearing
Clicking, snapping or popping Sharp, slow turns Excess end play in the bearing, or a worn outer CV joint
Wheel wobble or vibration Varies A damaged bearing, or lug nuts that are not torqued correctly
ABS or traction control light Any time In bad cases, bearing play can damage the wheel speed sensor or its tone ring

The classic bearing sound starts quiet and grows over weeks or months. Many people first notice it at highway speed with the radio off and think it is road noise.

How to tell which wheel is bad

Bearing noise travels through the axle, suspension and body, so it is hard to pin down by ear. Try this on a quiet, empty road or parking lot:

  1. Drive a few miles first so the grease is warm.
  2. At a steady speed where you hear the noise, gently swerve left, then right.
  3. If the noise gets louder when you swerve left, weight shifts onto the right side, so suspect the right bearing. Louder to the right points to the left side.
  4. Note whether it seems to come from the front or the rear. This is harder, and front versus rear is often confirmed on a lift.

Shops pin it down with electronic "chassis ears", small microphones clipped to each corner while someone drives. Some also check bearing temperatures with an infrared thermometer after a highway drive, since the noisy bearing usually runs hottest.

Bearing noise or something else?

Several common problems sound like a bearing. Rule these out before you buy parts:

  • Tires. Cupped, feathered or unevenly worn tires hum with speed too. Tire noise often changes with the road surface and usually stays about the same when you swerve. Run your hand over the tread and look for scalloped wear.
  • CV joints. A worn outer CV joint clicks in tight, slow turns. Timken notes that clunks when you shift or get on and off the throttle are usually CV joints, U-joints or the differential, not the wheel bearing.
  • Brakes. A dragging caliper or worn pads can grind or hum. Check for one wheel that is much hotter than the others after a drive.
  • Differential bearings. On rear-wheel-drive cars and trucks, a failing carrier bearing can sound like a wheel bearing. A shop may check the gear oil for metal.
  • Shimmy at a steady speed. Timken says this is usually tire balance, a bent wheel or worn suspension parts rather than the bearing.

How to check a wheel bearing at home

  1. Park on flat, solid ground, chock the other wheels and raise the corner. Support the car on jack stands. Never work under a car held up only by a jack.
  2. Grab the tire at 12 and 6 o'clock and rock it in and out. A healthy bearing has no play you can feel. A clunk or movement suggests bearing wear. Movement at 9 and 3 o'clock is more often a tie rod end.
  3. Have a helper watch the ball joints while you rock the wheel. If a ball joint is moving, that is your play, not the bearing. See our guide to bad ball joint symptoms.
  4. Spin the wheel by hand and feel and listen for roughness. Be aware that some bearings only make noise under the car's weight, so a smooth spin does not clear it.
  5. Scan for ABS codes. A wheel speed sensor fault on one corner can back up your diagnosis.

If you are not sure, have a shop check it. A worn bearing is a safety part, and an experienced tech with a lift and chassis ears can usually confirm it quickly.

Why wheel bearings wear out

  • Water and dirt. Once a seal fails, water and grit get into the grease and pit the races.
  • Impacts. Potholes and curb strikes can dent the races.
  • Loss of clamp. Timken lists loss of bearing clamp from corrosion or damage as a main cause, along with incorrect installation.
  • Bad installation. Hammering a bearing into place can dent the races and cause early failure. Pressed bearings need the right press tools.
  • Extra leverage. Low-offset wheels and wheel spacers push the tire further out from the hub, which adds load on the bearing. Our wheel offset calculator shows how far your new setup moves the tire.

Can you drive with a bad wheel bearing?

Only as far as a shop. A humming bearing is wearing, and it keeps getting worse. As play grows it can upset the ABS, wear the brakes unevenly and, in the worst case, overheat or come apart. If you hear grinding, feel play in the wheel, or the noise is getting louder quickly, stop driving the car and have it inspected.

Hub assembly or pressed bearing?

Most modern cars and trucks use one of two designs. The listing for your car tells you which one fits.

Type How it installs Tools Who it suits
Hub assembly (bolt-on unit) The bearing, hub and often the wheel studs and ABS sensor come as one unit that bolts to the knuckle Hand tools, a breaker bar and a torque wrench Confident home mechanics
Pressed-in bearing A bare bearing is pressed into the knuckle, then the hub is pressed into the bearing A hydraulic press or a bearing press kit Usually a shop job
Tapered roller bearings Older and some heavy-duty designs with separate bearings and races that are packed with grease and adjusted Basic tools plus the correct adjustment procedure Experienced home mechanics

On any of them, torque the axle nut and lug nuts to the factory spec with a torque wrench. Timken also warns never to spin a bearing with compressed air, because parts can fly out.

Install time and difficulty

A bolt-on hub assembly is a moderate job. On many cars it takes an experienced home mechanic one to two hours per side, longer if bolts are rusted or the axle nut is seized. A pressed bearing is harder. Most people take the knuckle to a shop to press, or have the shop do the whole job.

You do not usually need an alignment for a hub swap alone. If you removed the strut-to-knuckle bolts or the knuckle itself, get an alignment afterwards.

What it costs

Here is what bearing and hub assemblies cost on our store by brand, for one corner:

Brand Listings Typical price Range
Moog 60 $210 $101 to $477
Timken 56 $222 $82 to $512
SKF 42 $172 $84 to $327
ACDelco 25 $195 $101 to $340
Mevotech 16 $115 $90 to $208

Labor depends on the car, whether the bearing is pressed in, and how much rust you are fighting.

What else to check while it's apart

With the wheel off, look at the parts around the hub. Check the ball joints, tie rods and sway bar end links for play and torn boots, and check brake pad wear. Replacing the bearing on the other side at the same time is optional, but many people do it if both have the same mileage.

Our picks

Always confirm fitment for your exact year, model and drivetrain on the product page.

FAQ

What does a bad wheel bearing sound like?

Usually a hum, growl or rumble that rises with speed, like driving on rough pavement. A badly damaged bearing can grind, and loose ones can click in tight turns.

How do I know which wheel bearing is bad?

Swerve gently at the speed where you hear it. If it gets louder turning left, the right side is usually bad, and the reverse. A shop can confirm with chassis ears or by checking for play on a lift.

Is it safe to drive with a noisy wheel bearing?

Not for long. Drive it only as far as you need to get it inspected, and stop driving it if you hear grinding or feel play in the wheel.

Should I replace wheel bearings in pairs?

It is not required. If the other side has the same mileage and you are paying for labor, many people replace both at once.

Do I need an alignment after replacing a wheel bearing?

Not usually for a bolt-on hub swap. If the knuckle or strut bolts came off, get an alignment.

Can a bad wheel bearing cause an ABS light?

Yes. On many cars the speed sensor reads a ring in the hub, and excess bearing play can upset or damage it.

Sources

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Written by Shane Allen

Shane runs Lower HQ. He builds suspension and telemetry hardware and comes from a motorsport background that spans Formula Drift, sim racing and vehicle dynamics. These guides are written for people setting up their own cars and trucks, using the fitment and prices listed in our catalog.

Specs, fitment and prices come from each brand and can change. Check the product listing before you order, or ask us to confirm fitment.

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