You had an alignment done last year. But the tires are wearing unevenly again, your fuel consumption has crept up, and the steering wheel is ever so slightly off-center on a straight road. These are not random events: they are signs that alignment is due again.
We have written about how laser alignment works and what camber, caster and toe actually mean. This article focuses on two practical questions that come up constantly at our shop: how often should a heavy truck be aligned, and what does it cost, including for a full tractor-trailer setup?
Why alignment goes out of spec
Alignment does not drift on its own in a perfect world. In Quebec, we do not drive in a perfect world.
- Roads: spring potholes, expansion joints, construction zone patches on Routes 15 and 440. Every hard impact shifts suspension geometry slightly. It adds up over the season.
- Load cycles: a fully loaded truck endures enormous forces at every braking, cornering and acceleration event. Those forces act on steering and suspension components, and angles shift over time.
- Component replacement: every time a suspension part is replaced (leaf spring, bushing, shock absorber, steering rod), the angles can shift slightly. Alignment after any suspension repair is not optional.
- Normal wear: steering joints and rods accumulate slight play over kilometres. That play translates into variation in alignment angles.
Recommended alignment frequency by vehicle type
| Vehicle type | Recommended interval |
|---|---|
| Class 8 long-haul | 80,000 to 120,000 km / minimum 1x per year |
| Heavy truck, urban delivery | 40,000 to 60,000 km / 2x per year |
| Tractor-trailer (semi) | 80,000 to 100,000 km / 1x per year |
| Construction truck | 30,000 to 50,000 km / 2 to 3x per year |
| Pickup / light truck | 20,000 to 40,000 km / 1x per year |
💡 In Quebec, with our road conditions, lean toward the lower end of each range. An alignment at 60,000 km on a long-haul truck is not excessive: it is protection for a tire investment worth thousands of dollars.
Align regardless of mileage after: a significant pothole or impact, any suspension or steering repair, new tire installation, or every spring after the Quebec thaw season.
Tractor-trailer alignment: more complex than most people realize
Here is where many operators make a costly mistake: they align the tractor but not the trailer. Both need to be aligned, ideally at the same time.
The trailer has its own axles with their own angles. If the trailer axles are not parallel to each other and to the tractor, the whole unit side-scrubs slightly down the highway, a condition called dog-tracking. Dog-tracking is invisible at low speed but it destroys trailer tires and increases fuel consumption.
On a full tractor-trailer alignment, we check:
- Front axle alignment on the tractor (steering axle)
- Tandem axle parallelism on the tractor
- Trailer axle alignment and parallelism
- Relationship between the fifth wheel and the truck centerline
- Dog-tracking between tractor and trailer as a combined unit
⚠️ The real cost of skipping alignment
A misalignment of just 0.5 degrees can reduce tire life by 30 to 50%. On a Class 8 truck, a full set of tires costs $8,000 to $15,000. A misaligned truck also burns 3 to 5% more diesel: that is $3,400 to $5,700 wasted annually on a typical long-haul unit.
What does alignment cost?
| Vehicle type | Price range |
|---|---|
| Pickup / light truck (2 axles) | $150 to $250 |
| Heavy truck, 2 axles | $200 to $350 |
| Heavy truck, 3 axles (rigid) | $300 to $500 |
| Tractor only | $300 to $500 |
| Full tractor + trailer (semi) | $500 to $900 |
| With pre-alignment suspension inspection | + $100 to $200 |
Frequently asked questions
Does wheel alignment include balancing?
No. Alignment adjusts wheel angles relative to the chassis. Balancing equalizes the weight of each individual wheel to eliminate vibration. Both can be done at the same time, but they are separate jobs requiring different equipment.
Do I need to align the trailer every time?
Not necessarily every time. At least once per year for a dedicated trailer in regular service. If you swap trailers frequently, tractor-only alignment is sufficient.
How long does a heavy truck alignment take?
For a 2-axle truck, one to two hours. For a 3-axle rigid or a full tractor-trailer, plan two to four hours. If we find suspension components that need replacing before the alignment, it could be a full day.
I just had an alignment but the truck still pulls. Why?
A few possible causes: a worn suspension bushing creating dynamic play that overrides the static alignment, a steering component with play, or a tire with internal deformation. If the alignment was done correctly and the problem persists, we need to look at the suspension and steering system.
Laser alignment for every heavy truck configuration
From single delivery units to full tractor-trailers. We always inspect the suspension before alignment to make sure the adjustments hold. Ressorts Laval, Laval.
Call us at 450-661-5157.