Mastering Your Ride: The Truth About Wheel Alignment

You've probably been there: you pull into a tyre shop, perhaps for a puncture repair or new rubber, and the mechanic suggests a 'tracking check'. Twenty minutes later, your car is back, seemingly 'adjusted'. But a nagging doubt creeps in – how could something so crucial be done so quickly? And what exactly is 'tracking' anyway? These are excellent questions, and at RAC London, we believe in demystifying automotive jargon so you can make informed decisions about your vehicle's health and safety. The truth is, a quick 'tracking' check is often insufficient, and understanding the difference between that and a full wheel alignment could save you money, improve your car's performance, and even enhance your safety on the road.

What is Tracking, and Why Isn't It Enough?

Let's start with 'tracking', also known as 'toe'. In simple terms, this refers to how much your wheels point inwards or outwards when your car is travelling in a straight line. Think of it like your feet: if they point slightly inwards (toe-in) or outwards (toe-out) when you walk, that's analogous to your car's tracking. Ideally, for most vehicles, the wheels should be perfectly parallel or have a slight toe-in/toe-out as specified by the manufacturer for optimal straight-line stability and tyre wear.

The reason that 20-minute 'tracking check' is often inadequate is multifaceted. Firstly, it typically only addresses the front wheels. Secondly, it often uses basic, outdated equipment that lacks the precision required for modern vehicles. Thirdly, and most critically, 'tracking' or 'toe' is just one of several critical angles that determine your vehicle's wheel alignment. Addressing only one aspect is like trying to fix a complex puzzle with only one piece. If you want your car to drive safely, handle predictably, and prevent premature tyre wear, a partial check simply won't cut it.

The Comprehensive Four-Wheel Alignment: Precision and Performance

To genuinely address issues like a pull on the steering wheel, uneven tyre wear, or a general feeling of instability, your car needs a complete four-wheel alignment. This isn't a quick job; it's a meticulous process that can take up to two hours, depending on the vehicle and the adjustments required. It involves measuring and adjusting all four wheels to the manufacturer's precise specifications, using advanced, laser-guided equipment. This ensures that every wheel is perfectly aligned relative to the others and the vehicle's central axis.

At RAC London, we pride ourselves on our commitment to thoroughness. Many garages subcontract this specialised service, but we've invested in state-of-the-art Beissbarth wheel alignment equipment, which is the preferred choice for many high-end manufacturers like Audi, VW, Seat, Skoda, and Bentley dealers. This allows us to perform precise, in-house alignments. Furthermore, to guarantee every point is covered and nothing is missed, we always complete a detailed 'Before/During/After' check sheet, providing you with a transparent record of the work carried out.

What's Involved in a Four-Wheel Alignment Check?

A comprehensive four-wheel alignment goes far beyond just 'tracking'. It involves assessing and adjusting several crucial steering and suspension angles. While we won't get overly technical, understanding these angles provides insight into the complexity and importance of the procedure:

• Wheel Run Out: This is the measurement of how much each wheel moves as it rotates, both from side-to-side and up-and-down. High run-out can affect the accuracy of alignment measurements, so it's checked first.
• Tracking (Toe): As mentioned, this is the inward or outward angle of the wheels as viewed from above. Correct toe ensures straight-line stability and minimises tyre scrub. Incorrect toe can lead to rapid and uneven tyre wear.
• Camber: This refers to the tilt of the wheels from the vertical when viewed from the front of the car. Positive camber means the top of the wheel tilts outwards, while negative camber means it tilts inwards. Correct camber ensures even tyre contact with the road, crucial for grip and preventing premature wear on one side of the tyre.
• Caster: This is the tilt of the steering axis when viewed from the side of the car. Caster influences steering stability, effort, and the wheel's ability to self-centre after a turn. Positive caster, common in most cars, helps keep the wheels straight and provides a stable feel at speed.
• KPI (King Pin Inclination) / Steering Axis Inclination (SAI): As the name suggests, the king pin (or its modern equivalent, the steering axis) is the main pivot in the car's steering mechanism. KPI, combined with caster, forms the steering axis and affects steering effort and the tyre's scrub radius.
• Set-back: This occurs if one front wheel is set further back than the other. It usually indicates a bent component or a structural issue, often from an impact. Set-back can cause the vehicle to pull to one side.

With all these angles and more being meticulously tested and adjusted on all four wheels, you can truly appreciate why the entire process takes significantly longer than 20 minutes. This level of detail ensures your vehicle performs as the manufacturer intended, providing optimal safety and efficiency.

The Undeniable Benefits of Proper Wheel Alignment

Investing in a professional four-wheel alignment offers a multitude of benefits that extend far beyond simply having your steering wheel straight:

• Extended Tyre Life: Misaligned wheels cause tyres to scrub against the road rather than roll smoothly. This leads to rapid and uneven wear, significantly shortening tyre lifespan and costing you money in premature replacements. Proper alignment ensures even wear across the tyre tread.
• Improved Fuel Efficiency: When wheels are misaligned, your engine has to work harder to propel the vehicle, as there's increased rolling resistance. A properly aligned car rolls more freely, reducing drag and improving fuel economy.
• Enhanced Driving Safety and Handling: A correctly aligned vehicle handles predictably and responds precisely to steering inputs. It will track straight without needing constant steering corrections, reducing driver fatigue and significantly improving safety, especially at higher speeds or in adverse conditions. Issues like steering pull or wandering are eliminated.
• Reduced Wear on Suspension Components: Misalignment places undue stress on various steering and suspension components, leading to premature wear and tear. By maintaining correct alignment, you protect these vital parts, potentially saving on costly repairs down the line.

When Should You Consider a Wheel Alignment?

While it's good practice to have your alignment checked periodically (perhaps annually or every 12,000 miles), there are specific indicators that suggest an immediate alignment check is needed:

• Your car pulls or drifts to one side when driving on a straight, level road.
• Your steering wheel isn't centred when you're driving straight.
• You notice uneven or accelerated tyre wear (e.g., one side of the tyre is worn more than the other).
• Your steering feels loose, vague, or unresponsive.
• You've recently hit a significant pothole, curb, or been involved in a minor accident.
• You've replaced steering or suspension components (e.g., tie rods, ball joints, control arms).
• You've installed new tyres.

Quick Check vs. Full Alignment: A Clear Comparison

To summarise the crucial differences, consider this comparison:

Frequently Asked Questions about Wheel Alignment

Q: How often should I get my wheel alignment checked?
A: A good general rule is to have it checked annually or every 12,000 miles, whichever comes first. However, if you notice any of the symptoms mentioned above or after significant impacts, get it checked sooner.

Q: Is wheel balancing the same as wheel alignment?
A: No, they are different services. Wheel balancing addresses the even distribution of weight around the tyre and wheel assembly to prevent vibrations. Wheel alignment adjusts the angles of the wheels relative to each other and the car's body. Both are crucial for vehicle performance.

Q: Can bad alignment damage my car?
A: Absolutely. Beyond rapid tyre wear, poor alignment can put undue stress on steering and suspension components, leading to premature failure of parts like ball joints, tie rod ends, and wheel bearings. It can also negatively impact your car's braking performance and stability.

Q: Why is four-wheel alignment better than two-wheel alignment?
A: While some cars only allow adjustments on the front wheels, many modern vehicles (especially those with independent rear suspension) allow for rear wheel adjustments. Even if only the front wheels are adjustable, a four-wheel alignment machine measures all four wheels. This allows the technician to ensure the rear wheels are correctly aligned to the vehicle's centre line, providing a stable platform for the front wheels, which then align to the rear. This eliminates 'crabbing' (where the car drives slightly sideways) and ensures true straight-line tracking.

Q: What are the signs of bad wheel alignment?
A: Key signs include: your car pulling to one side, uneven or feathered tyre wear, a crooked steering wheel when driving straight, squealing tyres, or a loose/vague feeling in the steering.

In conclusion, don't be fooled by quick fixes when it comes to something as vital as your car's wheel alignment. A proper, comprehensive four-wheel alignment is an investment in your safety, your tyres' longevity, and your vehicle's overall performance. If you suspect your car needs attention, or you simply want the peace of mind that comes from a professional check, bring your wheels to us at RAC London. We're committed to providing the thorough, precise service your vehicle deserves.

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