Camber: the tyre that leans in

What camber actually is

Camber is the angle the tyre leans when you look at the car head-on. Negative camber tilts the top of the tyre inward, toward the car, so the wheels make a faint V. Positive camber does the opposite and is almost never what you want on a race car. When people talk about "running camber", they mean negative.

Why lean a perfectly good tyre over on purpose? Because a tyre standing dead upright at rest does not stay upright in a corner. As the car rolls onto its outside wheels, each loaded tyre tips out onto its outer shoulder and lifts its inner edge off the road — so only part of the tread is actually carrying the car. Pre-leaning the tyre inward means that, once roll tips it back the other way, it lands flat.

Static vs dynamic camber — and camber gain

Static camber is the number you dial in the garage with the car sitting still. Dynamic camber is the angle the tyre is actually running once you are mid-corner, after body roll and suspension travel have moved it. They are rarely the same — and the dynamic angle is the one that grips.

Two things change the angle as you drive. First, body roll leans the whole car over and tips the outside tyre toward its outer edge, eating into your negative camber. Second, the suspension geometry adds negative camber as the wheel compresses — this is camber gain, and it works in your favour. You set static negative camber precisely so that, once roll has taken some away and camber gain has added some back, the loaded tyre lands flat at the apex.

• Static — the garage number, car at rest. The thing you actually adjust.
• Dynamic — the real angle under cornering load, after roll and travel. The thing that matters.
• Camber gain — extra negative camber the geometry hands you as the wheel compresses. More gain means you can run less static.

The readout: inner, middle, outer temps

You cannot see dynamic camber on the screen — but the tyre tells you. Modern telemetry splits each tyre's carcass temperature into three: the inner edge, the middle, and the outer edge of the tread. The pattern across those three is the single clearest readout of whether your camber is right.

The logic is simple: the part of the tyre doing the most work runs the hottest. If the tyre is riding on one edge, that edge cooks while the other coasts cool. So the spread of inner-to-outer temperature is a direct picture of how the contact patch is loaded.

• Inner hottest → too much negative camber. The tyre is leaning so far it rides on its inner shoulder; the outer edge barely touches.
• Outer hottest → too little negative camber. The tyre tips onto its outside edge under load; the inner edge lifts.
• Even spread → about right. Inner a touch warmer than outer, sloping gently across — the tread is landing flat and the whole patch is working.

The trade-off — cornering grip vs the straights

Camber is never a free win — it is a trade. More negative camber buys cornering grip, but only up to the point where the tyre lands flat. Past that you are paying a tax everywhere the car is upright: under straight-line braking and on corner exit traction, the over-leaned tyre is no longer flat, so the contact patch shrinks and you give back braking distance and drive.

There is a second bill: tyre wear. Too much negative camber overworks the inner edge, which runs hot and wears faster than the rest of the tread — fine for one flying lap, costly over a stint. The right camber is the one that lands the tyre flat at peak load and keeps the wear and temperature even enough to last.

Read it first, then move it — corner by corner

Camber is only the right answer once you know which axle is riding on which edge, and where. SimRace.app pulls your full setup and a stand of specialist race engineers logs the inner / middle / outer temps, corner by corner, to locate the imbalance: which tyre, which edge, which corner type — and whether you are over- or under-cambered on that axle.

Front and rear are read separately, because they rarely want the same number. And one rule a good engineer never breaks: never load a tyre that is already saturated or overheating just to chase a temperature reading. The engineers prescribe the change one step at a time, judged over a few laps, and they tell you when the spread is even enough to leave alone. Camber lives next to tyre pressures, which also move the temps — so the engineers separate the two before touching either.

FAQ

The setup glossary

Camber is one lever among several, and it works hand in hand with the rest of the geometry and the tyre. The full toolkit, one page at a time:

• Tyre pressures
• Toe in & toe out
• Camber, toe & caster
• Mechanical balance
• The full setup guide →