The short version
- Alignment adjusts the angles your wheels sit at. It fixes pulling, off-centre steering and tyres wearing out on one edge.
- Balancing corrects tiny weight differences around the wheel. It fixes vibration that appears at speed and disappears when you slow down.
- Pull and uneven wear point to alignment. Vibration points to balancing.
- Both are cheap compared with the tyres they protect.
- If you are not sure, describe the symptom rather than naming the service.
Two different jobs, two different machines, and a lot of drivers paying for the wrong one. If your car pulls to the left on the PIE, alignment is your answer. If the steering wheel buzzes in your hands at 90km/h, alignment will not fix it and balancing probably will. Telling them apart takes about ten seconds, and it starts with what the car is doing rather than with what the wheels look like.
| What the car is doing | Which job |
|---|---|
| Pulls to one side on a flat, straight road | Alignment |
| Steering wheel sits off-centre while the car goes dead straight | Alignment |
| Tyres worn on the inner or outer edge | Alignment |
| Vibration that arrives at a set speed and fades as you slow | Balancing |
| Shake felt through the seat rather than the wheel | Balancing, usually at the rear |
| Cupped or scalloped wear around the tread | Either, so somebody has to look at it |
The difference, side by side
Most of the confusion disappears once you see the two jobs next to each other. They share a workshop and nothing else.
Wheel alignment
- Adjusts the angles the wheels sit at: toe, camber and caster
- Fixes a car that pulls, wanders or tracks off-line
- Fixes a steering wheel that sits crooked while you drive straight
- Stops tyres wearing out on the inner or outer edge
- Nothing is added to the wheel; the suspension is adjusted
Wheel balancing
- Corrects uneven weight distribution around the wheel and tyre
- Fixes vibration that arrives at a particular speed
- Fixes a steering wheel that shakes on the expressway but not in town
- Has no effect on tyre wear position or on pulling
- Small counterweights are clipped or stuck to the rim
What alignment actually adjusts
Alignment has nothing to do with the wheel being bent or heavy. It is about the angles the wheel sits at relative to the road and to the car.
There are three of them. Toe is whether the wheels point slightly inwards or outwards when viewed from above, and it is the one that destroys tyres fastest. Camber is the inward or outward tilt when viewed from the front, which is why a badly cambered wheel wears its inner or outer edge bald while the rest of the tread still looks healthy. Caster is the angle of the steering axis, and it is what makes your steering wheel want to straighten itself after a corner.
Every car leaves the factory with a specification for those angles. Kerbs, potholes, carpark ramps and ordinary suspension wear all nudge them out. A computerised alignment measures where they actually are, then brings them back to what the manufacturer asked for.
What balancing does instead
A wheel and tyre assembly is never perfectly even in weight. The difference might be a few grams, which sounds like nothing until that few grams is spinning at 900rpm.
At low speed you feel none of it. Somewhere around 80 to 110km/h the imbalance hits a frequency your steering column happily passes on to your hands, and the wheel starts to shimmer. That is why the classic description is “it only shakes on the expressway”. Balancing puts small counterweights on the rim until the assembly spins evenly, and the shimmer goes away.
The ten-second test
Ask yourself what the car is doing, not what the wheels look like.
Read your own symptom
- Car drifts to one side on a flat, straight road with your hands relaxed. That is alignment.
- Steering wheel sits off-centre while the car goes dead straight, badge visibly crooked. Alignment.
- Tyres worn on the inner or outer edge while the middle of the tread still looks healthy. Alignment, almost every time.
- Vibration that arrives at a set speed and fades when you slow down. Balancing.
- Shake felt through the seat rather than the wheel. Balancing, usually at the rear.
- Cupped or scalloped wear around the tread. Either, and sometimes a worn shock absorber instead. This one needs somebody to look at it.
Why the confusion costs money
Drivers routinely book an alignment to cure a vibration, then feel cheated when the shake is still there on the drive home.
The workshop did exactly what was asked of it; the request was simply the wrong one.
The reverse happens too. Somebody balances four wheels to stop a pull, the pull remains, and they conclude that alignment is a scam. Meanwhile the tyres keep wearing unevenly and a set that should have lasted years gets replaced early.
What a proper alignment job includes
Measuring is the easy part. The judgement is in what happens next.
Before we touch an adjustment we check tyre pressures, because an underinflated front tyre will make a car pull and no amount of alignment fixes that. We look at the tie rods, ball joints and bushes, since there is no point setting angles on a worn joint that will move again next week. We centre the steering wheel and lock it, because a car that tracks straight with a crooked wheel is a job half done. Then we road test it.
You should get a printout showing the before and after figures. If a workshop cannot show you what was out and what it is now, you have no way of knowing anything was done.
When to come and see us
Book an alignment check if the car pulls, if the steering wheel sits crooked, if you have just fitted new tyres, or if you have taken a solid hit from a kerb or pothole. Book balancing if the vibration arrives at speed.
If you cannot tell which, just describe what the car is doing. Our alignment specialist will measure before recommending anything, and if the answer is that your tyre pressures were low and nothing else, that is what you will be told. We are at Autobay @ Kaki Bukit, unit #02-61, and you can read what the alignment service covers on our suspension repair page.
