public void setSuspensionStiffness(float suspensionStiffness) {
        this.suspensionStiffness = suspensionStiffness;
        applyInfo();
    }
the stiffness constant for the suspension.  10.0 - Offroad buggy, 50.0 - Sports car, 200.0 - F1 Car

@param suspensionStiffness the desired stiffness coefficient
(10&rarr;off-road buggy, 50&rarr;sports car, 200&rarr;Formula-1 race car,
default=20)
jme3-jbullet/src/main/java/com/jme3/bullet/objects/VehicleWheel.java