Camber, toe & caster explained
The three alignment angles: what each one does, how each wears tires, and ballpark specs for street and track — plus the mm-to-degrees maths.
- Toe — whether the wheels point slightly in or out, seen from above. A stability and turn-in setting, and the fastest tire-killer of the three.
- Camber — the lean of the wheel, seen from the front. Negative (top tucked in) buys cornering grip and spends inner-shoulder tread.
- Caster — the tilt of the steering axis, seen from the side. Pure feel and stability; it does not wear tires at all.
The three angles
An alignment is three separate angles, each measured in its own plane:
- Toe looks down from above: do the wheels point at each other (toe-in) or away (toe-out)? It is specified per wheel, either in millimetres of tread offset or in degrees.
- Camber looks at the car head-on: does the top of the wheel lean in (negative) or out (positive)? Almost always in degrees.
- Caster looks from the side: the steering axis tilts back like a chopper fork. You will never see it in a tire-wear pattern — you feel it through the wheel.
Toe: the tire killer
With any toe at all, each tire is being dragged slightly sideways as it rolls — a permanent, low-grade scrub. Toe-in makes the car stable and self-centring; toe-out makes it darty but eager to turn in. Either way, too much of it feathers the tread blocks and can ruin a pair of tires in a few thousand kilometres.
Shops quote toe two ways: millimetres (tread offset at the tire) or degrees (the angle itself). Converting needs the tire diameter — 3 mm on a 630 mm tire is 0.273°, but on a 700 mm truck tire it is only 0.246°. "Total toe" is both wheels added together.
Camber: trading contact patch for cornering
In a corner the car rolls and the outside tire wants to lean out of its contact patch. Negative camber pre-leans the wheel the other way, so mid-corner — loaded and rolled — it stands flat and grips. That is why track cars run −2° to −3.5°.
On the straight drive home, the same car rides on its inner shoulders: braking grip suffers slightly and the inside edge wears first. Street cars therefore run just −0.5° to −1.2° — enough to help, not enough to eat tires.
Caster: the feel angle
Caster is the steering axis tilted backwards, like a bicycle fork or a shopping-trolley wheel: the contact patch trails the steering axis, so the wheel naturally wants to run straight. More caster means stronger self-centring, better straight-line stability and heavier steering; it also tips the wheels into dynamic negative camber as you turn — free cornering camber that disappears on the straights.
Caster wears nothing and is usually set to "as much as the chassis allows" — about +3° to +5° on the street, +6° or more where clearance permits.
Ballpark specs
Every chassis has its own numbers, but these ranges keep you out of trouble while you find them:
| Angle | Street daily | Spirited / track | The trade |
|---|---|---|---|
| Toe (front) | 0 to 1 mm toe-in / wheel | ~0 to 1 mm toe-out / wheel | stability vs turn-in — and tire edges |
| Camber (front) | −0.5° to −1.2° | −2° to −3.5° | inner-shoulder wear vs corner grip |
| Caster | +3° to +5° | +6° to +9° | steering weight vs self-centring |
Quick reference
Toe scrubs tires, set it first. Camber buys cornering grip with inner-shoulder tread. Caster is free stability — add all you can fit. And when a spec crosses units — millimetres, inches, degrees, minutes — the converter does the maths with your actual tire diameter.
FAQ
Which alignment angle kills tires fastest?
Toe, by a wide margin — a wrong toe setting scrubs the tread sideways on every single revolution and can feather a new tire to the cords in a few thousand kilometres. Camber wears one shoulder slowly; caster causes no wear at all.
Is some negative camber okay on a street car?
Yes — most factory specs sit between −0.5° and −1.2° for exactly the cornering benefit described above. Past about −2° the inner shoulder starts wearing noticeably on normal road driving, and braking grip in a straight line begins to suffer.
Why does my car pull to one side?
Usually a side-to-side mismatch: camber or caster that differs left from right, often after clipping a pothole or kerb. Tires themselves can also pull (conicity). If the steering wheel is off-centre too, that points at toe. An alignment rack shows all three in minutes.