How do I tell it from tyre noise?

Tyre noise changes tone with the road surface. Bearing noise ignores the surface, changes only with speed, and shifts on one side in bends.

Replace only one side?

Replacing the noisy side fixes it. The other side has the same mileage and won't be far behind, so doing both is a reasonable call.

While it's only noise, yes; once there's steering vibration or play, get it done soon. Avoid long motorway runs.

Toyota

HiAce Van: Speed-related humming / droning

Mechanic's note (reviewed by Tama Inc.)

If it starts droning at motorway speed, jack it up and rock the wheel. Play means the hub bearing. On the HiAce one side usually goes first.

Suspect the wheel hub bearing first (the bearing the wheel turns on). On high-mileage HiAces, a hum or drone that grows with speed almost always ends up here. Whether it's front or rear, left or right: if the noise changes in bends (louder in right-hand bends means the left side, and so on) you can narrow it down. It's easy to confuse with uneven tyre wear or differential noise, so the final check is jacking it up and turning the wheel by hand.

Based on 5 nationwide repair cases

What to suspect, in order

#1Wheel hub bearing5 cases 63%

How to tell (things you can check yourself): A drone that rises with speed and doesn't change with engine revs (even coasting in neutral). It gets louder or quieter in bends. When bad, vibration reaches the steering wheel and floor.
If you leave it: Play damages the brake disc and hub, adding to the bill. A seized bearing can lock a wheel while driving — dangerous.
Typical repair cost: Too few cases with a recorded price to give a figure
Typical model years and mileage: Concentrated on high-mileage vehicles and those carrying heavy loads.

#2Brake disc (rotor)2 cases 25%

Typical repair cost: Too few cases with a recorded price to give a figure

#3Brake pads1 cases 13%

Typical repair cost: Too few cases with a recorded price to give a figure

Confirm with an inspection. Have the wheel jacked up and turned to check for play and noise.

FAQ

How do I tell it from tyre noise?: Tyre noise changes tone with the road surface. Bearing noise ignores the surface, changes only with speed, and shifts on one side in bends.
Replace only one side?: Replacing the noisy side fixes it. The other side has the same mileage and won't be far behind, so doing both is a reasonable call.
Can I keep driving?: While it's only noise, yes; once there's steering vibration or play, get it done soon. Avoid long motorway runs.

Sources

Repair shop blogs (Japan)（5 cases）

No text is quoted from these sources. Only the facts of each case (model, symptom, cause, cost) are aggregated.

Reviewed by Tama Inc. (workshop certified by the Kanto District Transport Bureau)　Reviewed on 2026-09-11　Updated 2026-09-11

This page shows what to suspect first, based on aggregated nationwide repair cases and our own experience. Always confirm the cause with an inspection. Repair costs are medians and ranges from the cases; they vary by vehicle condition, region and workshop.