Slip angle

The skew angle is the tire the angle between the velocity vector at the wheel and the intersection between wheel center plane and road plane.

The wheel contact point is the intersection of three planes: the wheel center plane, the road plane and a plane which is perpendicular to the other two and passes through the center of the wheel.

A tire that is straight, while the vehicle is moving uniformly straight, has a skew angle of 0 °; a tire that is around 5 ° For example, to the left while the vehicle is moving because of a left turn due to understeer straight on, has a skew angle of 5 °.

Ensure that the tire can build cornering forces, the profile particles must be braced in the tire contact patch. In the free- rolling wheel, this strain initially builds a triangle below the skew angle. In the rear of the wheel tread deformation goes through sliding processes partially back. The larger the sliding at the rear of the contact patch, the more does the tire aligning torque again.

Values

A car tire on dry pavement reaches its maximum cornering force at about 8-12 degrees skew angle varies depending on the make and type of tire (summer - winter tires), after which it decreases again. The steering wheel announces entry into this limit, since the steering forces to go back. On motorcycles, the maximum cornering force is located at the rear wheel at about 4 degrees slip angle, the front wheel underneath.

Especially sports and racing tires have the peculiarity that the boundary area ( with relatively small slip angles ) begins very early and going beyond the range of fairly abrupt loss of adhesion of the tire is marked. Formula 1 tires have their maximum cornering force at 5 degrees ( Slick ) and 6 degrees for grooved tires, other racing tires are below 8 degrees slip angle.