What is wheel alignment and how often should it be checked?

What is Wheel Alignment?

Wheel alignment refers to the adjustment of a vehicle's suspension components - not the tires or wheels themselves. The goal is to set the angles of the wheels so they are perpendicular to the ground and parallel to each other. Proper alignment ensures that your car tracks straight, handles predictably, and wears its tires evenly over time.

The three primary alignment angles are:

Camber: The inward or outward tilt of the top of the tire when viewed from the front. Incorrect camber causes one edge of the tire to wear faster than the other.
Toe: The inward or outward angle of the tires when viewed from above. Excessive toe-in or toe-out leads to rapid, feathered tire wear.
Caster: The forward or backward tilt of the steering axis when viewed from the side. Caster affects steering stability and return-to-center feel.

Misalignment usually results from normal driving over potholes, curbs, or rough roads, not from a defect in the vehicle.

How Often Should Alignment Be Checked?

Manufacturer recommendations vary, but a common interval is every two to three years or every 30,000 to 40,000 miles. However, several conditions warrant an earlier inspection:

After a significant impact, such as hitting a deep pothole or a curb.
When you notice the vehicle pulling to one side on a flat, straight road.
If you see uneven or rapid tire wear across the tread.
After suspension repairs or replacement of components like tie rods, control arms, or struts.
As part of your routine tire rotation service (many shops will check alignment at no extra cost during rotation).

A simple visual inspection at home cannot confirm alignment accuracy. A professional alignment requires a specialized machine that measures all angles against the vehicle manufacturer's specifications.

Signs Your Alignment May Be Off

You don't always need a warning light to know alignment is off. Watch for these common symptoms:

Vehicle pulls to one side: Even on a level road with no crown, the car drifts left or right.
Steering wheel is off-center: The wheel does not sit straight when driving straight.
Vibration in the steering wheel: While often a tire balance issue, misalignment can also cause vibration.
Uneven tire wear: The inner or outer edge of the tire is noticeably more worn than the center.
Squealing tires: Tires may squeal during turns if alignment angles are extreme.

If you notice any of these, schedule an alignment check. Ignoring the issue can accelerate tire wear, reduce fuel economy, and make the vehicle less stable in emergency maneuvers.

What to Expect During a Professional Alignment

A reputable repair shop will:

Inspect suspension components for wear or damage before adjustments. Loose or worn parts must be repaired first, or the alignment will not hold.
Mount sensors on each wheel connected to an alignment machine.
Measure current angles against manufacturer specifications.
Adjust camber, toe, and caster as needed using factory procedures.
Provide a printout showing before and after measurements.

A standard alignment typically costs between $75 and $120 for most passenger vehicles. Prices may be higher for trucks, SUVs, or vehicles with advanced suspension systems.

Front-Wheel vs. Four-Wheel Alignment

Most modern vehicles require a four-wheel alignment, which adjusts both front and rear axle angles. Older vehicles with a solid rear axle often only need a front-end alignment. Your owner's manual will specify which type is appropriate. If you have a vehicle with independent rear suspension, always request a four-wheel alignment.

When to DIY vs. Use a Certified Technician

Checking and adjusting wheel alignment is a job best left to a certified technician. The process requires specialized equipment and knowledge of manufacturer specifications. DIY attempts using string or visual methods are rarely accurate and can lead to poor handling and accelerated tire wear.

You can check this at home:

Look at your tire tread for signs of uneven wear (inner edge, outer edge, or center).
Drive on a straight, level road and note if the steering wheel is centered and the car stays in its lane.

If you suspect misalignment, take the vehicle to a shop. Tell the technician what symptoms you observed. That information helps them confirm the problem and perform the correct adjustments the first time.