A steering wheel that vibrates at a certain speed and then settles is almost always a wheel balance problem. When the weight around a wheel and tyre isn't even, it shakes as it spins, and you feel it through the wheel, usually most at motorway speeds. Balancing fixes the great majority of cases. The exact symptoms tell you a lot about the cause.
What the speed tells you
How and when the vibration appears is the key clue:
- Comes in at a set speed, then fades (often 50-70mph): classic wheel imbalance.
- Only when braking: points to the brakes (warped discs), not the tyres.
- Constant, all the time: can be a buckled wheel, a damaged tyre or a worn component.
Balancing: the usual cause
No tyre and wheel are perfectly even in weight, so small balance weights are fitted to cancel out the difference, see wheel balancing explained. Vibration appears when that balance is lost, commonly after a balance weight falls off, a new tyre needs balancing, or a wheel takes a knock. A quick rebalance usually cures it.
Other causes to rule out
If balancing doesn't fix it, look further. A buckled alloy from a pothole (see claiming for pothole damage) can't be balanced out and may need straightening or replacing. A tyre damaged internally, or with a flat spot, can shake too. Alignment issues more often cause pulling than vibration, but worn suspension can contribute. A fitter can pinpoint which it is.
Why not to ignore it
Vibration isn't just annoying; left alone it shakes the steering and suspension components and can cause uneven, cupped tyre wear that ruins the tyre. Wheel bearings, track rod ends and shock absorbers all take the extra hammering, so a cheap balance can save an expensive suspension bill later. As it tends to get worse over time, it's cheapest to sort at the first sign rather than wait.
Steering wheel or seat: where you feel it matters
Vibration you feel through the steering wheel usually comes from the front wheels; vibration you feel through the seat or floor usually comes from the rears. The front wheels are connected to your hands through the steering, so any imbalance there goes straight to the rim of the wheel. The rear wheels have no such link, so an out-of-balance rear tyre tends to make the whole car shimmy rather than the wheel shake.
This is worth telling the fitter, because it narrows the job. A shake at the wheel with a calm seat points to the front pair. A buzz through the seat base or the floor with a steady wheel points to the rear pair. Both at once, and all four probably need looking at, which is normal after a set of new tyres or a long spell without a balance check.
One more clue: a vibration that changes when you rest your foot lightly on the brake at speed, without slowing much, is more likely a brake disc than a wheel. A vibration that stays exactly the same whether you are accelerating, coasting or braking is almost always in the wheel and tyre.
How to narrow it down before you call
Five minutes in the driveway rules out the simple causes and tells the fitter what to bring.
- Note the speed band. Write down where the shake starts and where it fades. A narrow band around 50 to 70mph is textbook imbalance.
- Look for a clean patch on the rim. A missing stick-on or clip-on balance weight often leaves a clean rectangle or a bare spot on the inside of the wheel where the weight used to be.
- Check for packed mud, snow or ice. A lump of frozen slush inside a wheel after a wet winter drive throws the balance off completely and clears itself once it thaws.
- Check pressures. A tyre well below the placard figure flexes more and can feel like a balance fault.
- Run a hand round each tyre. Feel for a bulge, a flat spot or a lifted section of tread. Any of those means the tyre, not the balance, is the problem.
- Think back. New tyres, a pothole strike, a kerb hit while parking or a recent wheel removal are the usual triggers.
| What you notice | Most likely cause | Usual fix |
|---|---|---|
| Shake at one speed band, fades above it | Wheel imbalance | Rebalance |
| Shake only when braking | Brake disc run-out | Brakes checked |
| Constant shake, worse with speed | Buckled wheel or damaged tyre | Wheel straightened or tyre replaced |
| Thump for the first mile, then gone | Temporary flat spot | None, it drives out |
| Wobble at low speed, like a loose wheel | Loose wheel nuts or a wheel not seated | Stop and check straight away |
Vibration after new tyres or a wheel change
A vibration that appears immediately after new tyres or a wheel swap is nearly always a fitting issue rather than a faulty tyre. The common ones are easy to put right.
- Not balanced, or balanced badly. Every new tyre needs balancing on its wheel. A weight that fell off on the first drive, or a wheel balanced with dirt in the barrel, gives the same result.
- Bead not fully seated. If the tyre has not popped evenly onto the rim all the way round, it runs slightly off-centre. A fitter checks this by looking at the moulded line just above the rim, which should be an even distance from it all the way round.
- Wheel not centred on the hub. Aftermarket alloys sometimes need spigot rings to sit true on the hub. Without them the wheel can be tightened fractionally off-centre.
- Wheel nuts tightened out of sequence. Nuts should be tightened in a star pattern to the manufacturer's torque figure, then rechecked after a short drive. Pulling one side up first can hold the wheel slightly askew.
- Old weight or corrosion on the hub face, which stops the wheel sitting flat against it.
If a vibration starts within days of a fitting, go back to whoever did the work. A reputable fitter will recheck the balance and the seating, and it is usually a quick adjustment rather than a new tyre.
What a wheel balance actually involves
Balancing spins the wheel and tyre on a machine that measures where the heavy spot is, then a small weight is fixed opposite it to cancel it out. It takes a few minutes per wheel and needs the wheel off the car, which is why it is normally done at the same time as a tyre fitting.
Two kinds of weight are used. Clip-on weights hook over the rim edge and suit steel wheels. Stick-on weights are fixed inside the barrel of an alloy so nothing shows on the face. Either is fine as long as the weight matches what the machine asked for and is fixed to a clean, dry surface, which is why winter grime inside the wheel matters.
A balance does not last forever. Tread wears, weights loosen and a pothole can shift things, so it is sensible to have wheels rebalanced whenever a tyre comes off, and any time a vibration returns. TyreSafe lists correct fitting and balancing among the basics of a properly maintained tyre. Balancing does not correct a buckled wheel or a tyre with internal damage, and a machine that keeps asking for large weights on one wheel is a sign that one of those is the real cause.
Getting the wheels balanced
We offer mobile wheel balancing from our base at Brent Cross, NW2; call and we will tell you whether we can reach you.
