Wheel angle?

Hello, I'm making a Drift-ish car, and I keep noticing that whenever the car hits something, a wheel points at a different angle, and unbalances the steering, any help?

 

You mean that you hit the wheels against something and they bend ? That's perfectly normal, it depends on what car you use: for example the sunburst's wheels bend very easily, while the D-series's wheels are more solid.