Hello!

I recently upgraded my Unity to Unity 5 and with it the Rigidbodies changed to GetComponent.

Now my rigidbody center of masses are messed up. :frowning:

Vector3 temp = GetComponent<Rigidbody>().centerOfMass;
temp.y = 0f;
GetComponent<Rigidbody>().centerOfMass = temp;

The problem isn’t your center of mass, it’s that your rigidbody doesn’t have enough mass. Unity 5 wheelcolliders require realistic values to function correctly. Your car is only 300kg; a real car is generally not too far above or below 1500kg. Using mass values that are too low is causing the bouncing.