Wheel Geometry

The Wheel Geometry section is where all the wheel related inputs are entered. Such as track, offset, camber, toe, rim and tire dimensions.

To input or modify the wheel geometry;

1.     Select the Suspension Design Item that you want to modify the wheel geometry of.

2.     Click the Summary button to display the Input Summary Window.

3.     Scroll down to the Wheel Geometry section.

4.     Enter values.

Half Track

The Half Track is the horizontal distance from the center of the tire contact patch to the Longitudinal Axis.

Longitudinal Offset

The Longitudinal Offset is the distance from a plane located perpendicular to the Longitudinal Axis to the suspensions Origin. Longitudinal Offset can be used when the suspension coordinates are not measured form the origin but another location.

Static Camber

Static camber is the angle between the wheel plane and the vertical, while the car is in a stationary position. Negative camber is defined as the wheel plane being tilted towards the center of the vehicle. While positive camber is defined as the wheel plane being tilted away from the center of the vehicle.

Static Toe

Static toe is the angle between the wheel plane and the longitudinal axis of the vehicle. Positive toe (toe out) is when the front of the wheels are steered outwards while negative toe (toe in) is when the front of the wheels are steered inwards.

Rim Diameter

The Rim Diameter is the diameter of the rim edge not the tire bead seat. This is used as a reference point to measure toe distance.

Tire Diameter

The Tire Diameter is the outside diameter of the tire. The user can choose to use either the unloaded, loaded or rolling diameter of the tire

Tire Width

The Tire Width is the overall width of the tire. OptimumK models the tire as an un-deformable disc so this dimension is not used in the calculation. The tire width is only used in the 3D display and to define the wheel axis in the output section