Start With the Angles Nobody Explains

Your tyres are the only part of the car touching the road, and alignment decides how much of each tyre is actually doing work. Factory settings are a compromise built around a fully loaded car, cheap tyres and a driver who may never see a redline. Once you want a fast road car that turns in crisply or a track car that stays predictable over a full session, camber and toe become the two most useful tools you have.

Angles are measured in degrees and minutes, where 60 minutes equals one degree. A change of 10 minutes of toe is noticeable from the driver's seat; 30 minutes can transform a car. That is why a proper four-wheel alignment with a printout is worth far more than a quick string-and-eyeball job.

Camber: How Much Lean, and Where

Camber is the vertical tilt of the wheel seen from the front. Negative camber means the top of the wheel leans in towards the body. As the car rolls into a corner, the outer tyre tries to roll onto its outside shoulder. A bit of negative camber holds the tread flatter on the road under load, which means more grip and far less shoulder scrubbing.

The downside is real. Too much negative camber shrinks the contact patch under braking, makes the car tramline on cambered B-roads, and wears the inner shoulder because the tyre spends most of its life going straight. You are trading longevity for cornering bite.

• Fast road front: around -1.0 to -2.0 degrees
• Fast road rear: around -0.8 to -1.5 degrees
• Track front: around -2.5 to -3.5 degrees
• Track rear: usually a little less than the front

On a MacPherson strut front end, camber usually needs adjustable top mounts or camber bolts. Double-wishbone cars often use shims. If your car has no adjustment at all, find out before you book anything.

Toe: The Sharpest Tool You Have

Toe is the angle of the wheels seen from above. Toe-out means the fronts of the wheels point away from each other; toe-in means they point towards each other. It is the single biggest influence on how a car feels in the first metre of a corner.

Front toe-out sharpens turn-in because the inside wheel is already angled into the corner. The car feels immediate, almost darty. The cost is straight-line stability: it wanders, follows ruts under braking and scrubs the inner edges of both front tyres quickly. Front toe-in does the opposite — calm, self-centring, stable at motorway speed, but slower to react and harder on outer shoulders.

Rear toe is a stability dial. A little rear toe-in, say 10 to 20 minutes total, makes the back end predictable on lift-off and reassuring in the wet. Zero rear toe or a touch of toe-out lets the car rotate more freely, which is fun until it bites you at speed on a damp roundabout. For most fast road cars, rear toe-in is the sensible choice.

A Sensible Fast-Road Baseline

If you want one setup that works everywhere, start here and adjust from it:

• Front camber: -1.5 degrees per side
• Rear camber: -1.2 degrees per side
• Front toe: 0 to 5 minutes toe-out total
• Rear toe: 15 minutes toe-in total

Set the thrust angle first so the rear axle points straight down the car. Uneven left-to-right figures will make the car pull and wear one tyre faster even if the totals look correct. If you can, have the car corner-weighted with your weight in the driver's seat, or ballast of the same amount.

Track-Day Tweaks and What They Cost You

For a track day, a common step is front camber at -2.5 to -3.0 degrees, front toe-out of 10 to 15 minutes total, and rear toe-in of about 10 minutes. You gain turn-in and mid-corner grip, but you will scrub inner shoulders on the drive home and the car will feel nervous in standing water. Tyre pressures matter just as much: aim for roughly 30 to 34 psi hot, and check them the moment you come in.

Use a pyrometer to check tread temperatures across each tyre. A spread of 5 to 10°C across the tread is healthy. A much hotter inner edge usually means too much negative camber or too much pressure; a much hotter outer edge means you need more camber.

Making Changes Stick

Change one thing at a time. Record your baseline numbers, drive a road you know well, then adjust and repeat. Re-check the alignment after a track day, a kerb strike or any suspension work, because eccentric bolts and shims move. Worn bushes, tired top mounts and knackered dampers will undo your careful settings within a few hundred miles.

Finally, remember that alignment cannot rescue bad tyres. A fresh set of quality rubber with a modest, well-chosen setup will beat an aggressive alignment on worn tyres every single time.