24/11/2017
Many drivers overlook the critical importance of proper wheel alignment, often considering it a secondary concern to tyre pressure or tread depth. However, for those seeking to maximise the lifespan of their tyres and ensure optimal vehicle handling, alignment is arguably more significant than the tyres themselves. A misalignment, even a subtle one, can lead to considerable tyre scrubbing, a phenomenon where the tyre surface is dragged sideways across the road. This scrubbing action accelerates wear and tear, reducing the effectiveness and longevity of your tyres.
The severity of this scrubbing is amplified depending on the tyre type and pressure. For off-road or 'knobbly' tyres that operate at lower pressures, the sideways drag is more aggressive and happens at a much faster rate compared to harder rubber compounds used at higher pressures. This means that even seemingly minor alignment issues can have a disproportionately large impact on certain types of tyres.
Understanding 'Toe' in Alignment
When discussing wheel alignment, the term 'toe' is frequently used. This refers to the angle of the wheels relative to the vehicle's longitudinal axis. Your vehicle's technical manual will typically specify a 'toe' setting, often expressed as a range, such as 4 plus or minus 3 millimetres. Crucially, this usually indicates a requirement for a slight 'toe-in', meaning the front edges of the wheels are closer together than the rear edges. This design choice is intentional; it helps to keep the vehicle tracking straight and stable during forward motion.
The problem, however, lies in the practical application of achieving this precise alignment. Simply chalking lines on the floor or relying on rudimentary alignment methods often fails to achieve the accuracy required. Following basic alignment instructions won't typically dial your vehicle in with the precision that a calibrated system can. For the best results, especially in achieving the ideal 'toe-in' setting, it is highly recommended to use a professional computerised alignment system and a dedicated alignment rack.
The Benefits of Professional Alignment
My personal experience, particularly with a Geo Metro, highlights the benefits of a professional alignment. The specification for this vehicle is around 2 degrees of toe-in, a setting that works exceptionally well for me, especially with the street tyre and rim configurations I commonly use. I recall the first time a technician fitted sensors to all the wheels and inputted the specific geometric distances for the vehicle. He remarked, "Why didn't you tell me Geo Metro?" – indicating that the vehicle’s requirements were unusual but easily accommodated by the professional equipment.
The technician also explained an interesting aspect of toe-in related to suspension geometry. He noted that the normal loading on the shock absorbers and springs tends to momentarily decrease the toe-in angle, which then returns to its normal setting as the suspension settles. This dynamic behaviour underscores the need for precise adjustments that account for these forces. The key takeaway here, as advised by professionals, is that it is absolutely crucial to never have 'toe-out', where the front edges of the wheels point outwards, as this invariably leads to instability and excessive tyre wear.
Early Signs of Misalignment
It's not uncommon to notice early signs of tyre scrubbing even on relatively new vehicles, as I observed with my 865R. Despite not having subjected it to harsh off-road conditions, I noticed premature wear patterns. A quick check confirmed that the alignment was significantly out of specification; the sensors used by the alignment equipment were registering readings 'off scale'. This experience serves as a stark reminder that the tyres of any new vehicle should be carefully inspected within the first month of ownership.
Even with power steering, the difference in driving feel between an aligned and a misaligned vehicle is palpable. You might not realise the extent of the issue until you experience both states. It's important to understand that misalignment doesn't always manifest as a noticeable pull to one side. If both wheels are misaligned by the same amount, either positive (toe-in) or negative (toe-out), the vehicle can still drive relatively straight. The characteristic 'pull' often occurs when one wheel has been subjected to a more significant impact or force, leading to a differential misalignment.
What Happens If Both Wheels Are Out of Alignment?
When both wheels are out of alignment by the same degree, the vehicle might still track straight, but this doesn't mean there are no consequences. The primary issue remains accelerated tyre wear. The tyres will be scrubbed across the road surface, leading to uneven wear patterns and a significantly reduced lifespan. This can manifest as feathering on the tyre edges or a general 'dull' appearance across the tread, indicating that the rubber is being abraded prematurely.
Furthermore, even if the car tracks straight, the steering might feel heavier or less responsive. The tyres are constantly fighting against the intended direction of travel, requiring more effort from the steering system. This can lead to increased fuel consumption as the engine works harder to overcome the rolling resistance.
Consider the following table outlining the effects of different types of misalignment:
| Alignment Issue | Effect on Tyre Wear | Effect on Handling |
|---|---|---|
| Toe-in (Excessive) | Inner or outer edge wear, feathering | Stable tracking, but can feel 'heavy' |
| Toe-out (Any amount) | Outer edge wear, feathering | Unstable tracking, 'darting' sensation, difficult to keep straight |
| Camber (Negative/Positive) | Inner or outer edge wear respectively | Pull to one side, uneven tyre contact |
| Both wheels misaligned equally | Even scrubbing across both tyres, faster wear | May track straight but with increased resistance |
Common Causes of Misalignment
Several factors can contribute to a vehicle's wheels falling out of alignment:
- Impacts: Driving over potholes, curbs, or other road debris can knock suspension components out of place.
- Wear and Tear: Over time, suspension components like ball joints, tie rod ends, and bushings can wear out, leading to play and misalignment.
- Accidents: Even minor collisions can affect wheel alignment.
- Improper Installation: Incorrect fitting of new suspension parts or tyres can sometimes lead to alignment issues.
- Spring Sag: If one side of the vehicle's springs sags more than the other, it can alter the alignment angles.
Frequently Asked Questions
Q1: How often should I get my wheel alignment checked?
It's generally recommended to have your alignment checked annually, or whenever you notice signs of uneven tyre wear, your vehicle pulls to one side, or after hitting a significant pothole.
Q2: Can I fix wheel alignment myself?
While minor adjustments to 'toe' can sometimes be made with basic tools, achieving accurate alignment requires specialised equipment and knowledge. Professional alignment is strongly recommended to ensure correct angles and prevent further damage.
Q3: What are the symptoms of bad wheel alignment?
Common symptoms include uneven tyre wear (e.g., wear on only one edge of the tyre), the vehicle pulling to the left or right, the steering wheel being off-center when driving straight, or a general feeling of instability.
Q4: My car still drives straight, so do I really need an alignment?
Even if your car tracks straight, subtle misalignments can still cause accelerated tyre wear and increased fuel consumption. It’s always best to have it checked by a professional to ensure optimal performance and tyre longevity.
In conclusion, maintaining proper wheel alignment is a fundamental aspect of vehicle care. It directly impacts tyre life, fuel efficiency, and overall driving safety and comfort. Don't underestimate the importance of this often-overlooked maintenance task. A quick trip to a reputable garage for a professional alignment, costing around £35 as per my experience, can save you significant money and hassle in the long run by preserving your tyres and ensuring your vehicle handles as it should.
If you want to read more articles similar to Tyre Wear and Wheel Alignment Woes, you can visit the Maintenance category.