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The inward or outward tilt of a tire when viewed from the front of the car. Negative camber (top of tire tilted inward) helps maintain a larger contact patch during cornering, improving grip.
Seward's Race Car Design defines it: "Wheel camber angle is the angle between the plane of the wheel and the vertical. Camber is said to be positive if the top of the wheel is leaning outwards relative to the vehicle and negative if leaning inwards. In the case of roll, the heavily loaded outer wheel has positive camber and the lightly loaded inner wheel has negative camber." Staniforth's Car Suspension adds: "Camber angle is the degree of difference between the wheel's vertical axis perpendicular to the surface — the majority of vehicles will have a camber angle close to zero degrees, which leaves the tyre contact patch in direct contact with the surface and will maximize traction." On track, negative static camber compensates for roll-induced positive camber on the loaded wheel, keeping the contact patch flatter during cornering.