Wheel alignment: why your car pulls, why your tires wear out and why the price can change

By the Centre d’Auto Champ d’Eau team, published October 18, 2026

A car that pulls to one side doesn’t always need an alignment. On the other hand, a car that drives perfectly straight can still wear out its tires early. And the advertised price of an alignment doesn’t always cover what the measurement reveals once the vehicle is on the rack.

In this guide, we explain what we actually see in our shop: what makes a car drift, which angles get adjusted, the repairs sometimes discovered during the measurement, and why rust from our winters can turn a simple adjustment into a longer job. The photos come from vehicles we have repaired.

How to recognize an alignment problem

The most common signs are:

• a steering wheel that isn’t straight when the car is driving in a straight line;
• a car that drifts to one side on a flat road;
• uneven tire wear: one edge more worn than the other, or tread ribs wearing in a “sawtooth” pattern;
• tires squealing in low-speed turns, without aggressive driving.

None of these signs alone proves that the alignment is the cause: a tire, a brake or a suspension part can produce the same symptoms. That’s why the inspection comes before the adjustment.

Why does my car pull to the right or left?

A drift can come from the road, the tires, the brakes or the wheel geometry. Before concluding that the alignment is at fault, the simpler causes need to be ruled out.

The road: ruts and road slope

Under the effect of heat and repeated heavy-vehicle traffic, asphalt can sink into two long parallel grooves: ruts. Tires tend to follow them, which forces the driver to keep correcting the car’s path. When it rains, water collects in them and sometimes forms two visible strips of water along the road.

Many roads are also deliberately sloped toward the shoulder to drain water. This slope can make the car drift slightly toward the lower side, even if the geometry is correct. To compensate, the specifications of some vehicles call for a slight caster or camber difference between the left and right sides. Two values that are both “within tolerance” can therefore still cause a drift if the difference between them is poorly balanced.

Tires: pressure, construction and wear

Uneven pressure between the two sides is enough to make a car pull. Because of its internal construction, a tire can also create a slight sideways push: this is called conicity, or radial pull. This defect can’t be seen with the naked eye and can affect a new tire. Irregular wear can produce the same effect.

To check, the technician usually swaps the two front tires from left to right (unless they are directional). If the pull switches sides, the tire is the cause, not the alignment.

Brakes, steering and suspension

A sticking brake caliper makes the car pull, often more so when braking. Other possible causes include: worn control arms or ball joints, inner or outer tie rods, a steering rack with play, a bent strut, a seized upper strut mount bearing, a sagging spring that changes the ride height on one side, a shifted subframe, or worn or bent rear suspension components.

Two cars on the same road don’t react the same way

The width and construction of the tires, their pressure, the condition of the steering and suspension, and the geometry angles all affect how sensitive each vehicle is. One car can follow ruts much more than another on the same stretch of road.

How to observe your car’s behaviour safely

First, check the cold pressure of all four tires against the label on the driver’s door frame. Then choose a safe road in good condition that is as flat as possible. Notice whether the car always pulls to the same side or only on certain stretches, and whether the steering wheel is centred when driving straight.

My car still pulls after an alignment: is that normal?

It happens, and it doesn’t necessarily mean the repair or the alignment was done poorly. While a suspension or steering part was faulty, the tires may have worn unevenly. An alignment corrects the wheel geometry, but it doesn’t erase that wear.

If the car still pulls even though the final measurements are within specification, ask to see the alignment report, then have the tires (left-to-right swap to detect conicity) and the brakes checked. Depending on the case, an appropriate tire rotation or replacing a tire can solve the problem.

Can a car that drives straight be out of alignment?

Yes. If both sides are out of adjustment in the same way, their effects cancel each other out: the car drives straight, but the tires still wear. An alignment therefore isn’t only about the car’s path. It is also about even tire wear, stability and predictable handling in different conditions.

Shop example: inner wear on rear tires

In our shop, we have seen premature wear on the inner shoulder of the rear tires on some Kia Sportage and Dodge Journey vehicles, even though their owners noticed no drift. This doesn’t mean every one of these models is affected: suspension condition, the load carried and previous adjustments vary from one vehicle to another.

The most common cause of inner wear at the rear is toe out of tolerance, sometimes combined with too much negative camber. A bent part or abnormal ride height can also contribute. Only the measurement can tell them apart.

How an alignment is done

The pre-alignment inspection

Before measuring anything, the technician does a basic check of anything that could skew the measurements or prevent the adjustment from holding:

• the condition, wear and pressure of all four tires, as well as the tire size installed;
• play in the ball joints, tie rods, control arm bushings and wheel bearings;
• the condition of the shocks, springs and mounts;
• signs of impact: bent rim, control arm or spindle;
• the vehicle’s ride height and any unusual load in the trunk.

A worn part must be replaced before the alignment: adjusting the geometry on a part that has play doesn’t give a lasting result.

Measurement and adjustments

The vehicle is placed on the rack, sensors or targets are attached to the wheels, and the machine compares each angle with the manufacturer’s specifications for that model. When the rear is adjustable, it is usually adjusted first, since it determines the thrust angle. The front is then adjusted (caster and camber when adjustable, then toe), while centring the steering wheel. A new measurement confirms the result.

On many recent vehicles, a final step is added: resetting the steering angle sensor, and sometimes calibrating the front camera used by lane keeping assist. These systems need to know where the vehicle’s “straight ahead” is after the adjustment. If the sensor isn’t reset according to the new thrust line, the driver assistance systems can interpret a straight steering wheel as a turned one.

These operations are done with a diagnostic tool (scanner) connected to the vehicle. On some models with air suspension or rear-wheel steering, the scanner is also used to put the vehicle into alignment mode or to re-centre the system. Requirements vary by manufacturer: ask whether your vehicle needs it and whether it is included in the price.

In our shop, we perform scanner procedures, such as resetting the steering angle sensor. We don’t do camera calibration: if your vehicle requires it after the alignment, it will need to be done at the dealership or at a specialized shop.

Why are other repairs sometimes discovered during an alignment?

The inspection and the measurement are two different steps. The inspection spots worn parts. But it’s only once the car is on the rack, with the values recorded and compared with the specifications, that we know which angles are out of tolerance and whether the available adjustments are enough to correct them.

After steering or suspension parts are replaced, the measurement therefore sometimes reveals that another adjustment is needed, often at the rear.

Why we don’t do a full inspection with every alignment

As we’ve seen, many factors can affect the geometry: tires, brakes, suspension and steering parts, rust, deformation after an impact. It would be impossible to detect them all in advance without a thorough diagnosis of every vehicle.

Making every customer pay for a general inspection, just in case another problem exists, would be neither reasonable nor fair: many alignments are done without any complications.

So our approach is simple. We assume your case is standard: we do the basic check described above, then the alignment. If the measurement, the condition of a part or the problem you described to us reveals something else, we adapt the work. We then explain what we found, and we wait for your approval before any additional work.

We never assume in advance that your vehicle has a serious problem. In return, we ask for a little understanding when a complication comes up along the way: often, it could only be discovered at that stage.

Why some angles aren’t adjustable from the factory

Depending on the suspension design, some angles have no adjustment provided by the manufacturer: the position of the mounting points is set at the factory, and the vehicle is expected to stay within tolerance as long as the parts are in good condition. On other vehicles, the adjustment exists, but its range is too short to correct a large deviation.

When an angle stays out of tolerance, the technician must first look for a mechanical cause: a bent part, a worn bushing, a sagging spring, abnormal ride height. Only then can a compatible correction part be offered: an adjustable control arm, an eccentric bolt or a shim, depending on the vehicle.

Seized eccentric bolts: when rust complicates the alignment

An eccentric bolt is used to adjust an angle: turning it moves the suspension arm slightly. In Québec, humidity and road salt attack these fasteners. Two problems can then occur: the bolt becomes impossible to turn, or its shank corrodes and fuses to the metal sleeve of the bushing. The bolt then turns with the bushing instead of coming out, and the planned adjustment becomes impossible without mechanical work.

When normal removal fails, a controlled cut is sometimes the only solution. It is followed by replacing the fasteners, and often the arm itself. Sometimes a part that still works must also be replaced, simply because it can no longer be separated from the seized fastener without being damaged.

Shop example: 2015 Volkswagen Tiguan

On this Tiguan, the rear fasteners were seized on both sides. Both rear control arms had to be cut to be removed, then replaced.

Shop example: 2018 Kia Sportage

On this Sportage, the rear control arm had to be removed by cutting in order to free a seized eccentric bolt and allow the repairs. The photos show the suspension once the new control arm was installed.

A seized bolt can also doom a shock absorber in good condition

The same seizing can happen at the lower mount of a rear shock absorber, as on this Kia Sportage. When the bolt stays trapped in the sleeve despite attempts to remove it, it may be necessary to sacrifice a part that still works in order to separate the assembly.

This kind of situation explains why a bill can exceed the price of a simple alignment: it’s no longer just a matter of adjusting angles, but also of freeing or replacing seized parts.

How much does an alignment cost, and why can the price go up?

What a standard alignment includes

Each shop defines its own package. In general, it includes a preliminary check of the tires and of the parts that affect the geometry, adjusting the tire pressures, installing the sensors, measuring the angles, comparing them with the manufacturer’s specifications, and then the adjustments included in the package.

The package doesn’t necessarily include every rear adjustment. Some shops include them in a four-wheel alignment, others charge for them separately. Before the work, ask what is included in the advertised price for your vehicle.

What can be added

• Rear camber or toe to correct on one or two wheels, with labour time that depends on access to the fasteners and their condition.
• Installing a correction part, when the original adjustment is missing or insufficient.
• Freeing or replacing seized fasteners, and sometimes the parts around them.
• Electronic procedures required by some manufacturers (steering angle sensor reset, suspension alignment mode), which take time and a diagnostic tool.

Your rights in Québec

Québec’s Consumer Protection Act governs car repairs. For a repair over $100, the shop must give you a written estimate before starting. Once accepted, this estimate sets the price: it can’t be exceeded without your consent. Repairs over $50 are guaranteed for 3 months or 5,000 km, whichever comes first. For details, see the Office de la protection du consommateur reminder sheet (PDF, in French).

Why pay if the alignment can’t be completed?

Putting the car on the rack, installing the sensors, measuring and analyzing are already real work. Often, the technician can make the adjustments that are possible and tell you which ones require parts. If parts are replaced afterwards, a new measurement, and sometimes a new alignment, will be needed.

This doesn’t mean an incomplete alignment should be billed at the price of a complete one. The bill must reflect the agreed service, the work actually done and the additional repairs you authorized. Don’t hesitate to ask what conditions apply when you come back for the final alignment after repairs.

How to read your alignment report

The report printed or sent after the work is the best tool for understanding what was done. For each wheel and each angle, it usually shows:

• the value before the work and the value after;
• the manufacturer’s tolerance range (minimum and maximum), often with a target value;
• a colour code on many machines: within tolerance or out of tolerance;
• overall values, such as the total toe of an axle and the thrust angle.

Here are the terms to look for on the report:

Real example: a 2019 Mazda CX-5 on our rack

This report comes from our shop; it contains no customer information. Values in red are out of tolerance, values in green are within tolerance.

Here’s how to read it:

• Front right: toe measured 0.50°, above the maximum of 0.25°. It was brought back to 0.10°.
• Rear left: toe measured −0.20°, below the minimum of −0.10°. It was brought back to 0.10°.
• Thrust angle: it went from −0.10° to 0.05°. The rear now pushes almost along the vehicle’s centreline, which allows the steering wheel to be centred.
• Rear left camber: it moved slightly (from −1.25° to −1.30°) even though it wasn’t targeted. On many rear suspensions, adjusting toe slightly changes camber. It remains within tolerance.
• Caster and SAI: they didn’t change. Here, they serve as a check: an abnormal difference between left and right could point to a bent part.

Above all, compare the before and after columns: you’ll see which angles were corrected and which remain out of tolerance. An angle that stays out of tolerance after the work should be explained: no factory adjustment, a seized fastener or a part to replace. If an angle isn’t adjustable on your vehicle, the machine often displays it anyway; that doesn’t mean it was forgotten.

Getting help from an artificial intelligence tool

You can also use an artificial intelligence tool to better understand your report. Take a photo of it, then ask a specific question, for example: “Explain this alignment report to me: which angles were corrected and which are still out of tolerance?”

The tool can help you understand the terms and prepare your questions. However, it can misread a number or be wrong about your vehicle’s specifications, and it can’t see the condition of the parts. It therefore doesn’t replace the inspection or the explanation from the technician, who has the vehicle in front of them.

When to see a mechanic quickly

Some signs go beyond a simple alignment and call for an inspection without delay:

• the car suddenly starts pulling, or the steering wheel goes off-centre, after hitting a pothole or a curb;
• clunking or knocking in the suspension or steering;
• hard steering or, on the contrary, unusual play in the steering wheel;
• a strong vibration in the steering wheel or the seat;
• the car pulls hard when braking;
• an error message or unusual behaviour from the driver assistance systems (lane keeping, emergency braking) after an alignment, a suspension repair or an impact;
• a tire with a bulge, a cut, exposed cords or wear reaching the wear indicators.

Frequently asked questions

Learn more: our 3D wheel alignment service, suspension and steering repair, and our tire and brake services.