Slip angle is a measure of the distortion of a tyre in cornering.

Slip angle is the difference between the direction of travel of the tyre and the direction the centreline of the contact patch is pointing.

If the slip angles of the front tyres are greater than the slip angles of the rear tyres, the car will understeer.

If the slip angles of the front tyres are less than the slip angles of the rear tyres, the car will oversteer.

If the slip angles of the front and rear tyres are the same, the car will neutral steer.