Quote - Good point, pfhew this was a long time ago for me.
Best way to solve this might be the next:
Draw a spoke from the center to the circle and place the back wheels on that spoke.
In a turn the front wheels wil follow the circle but leave the circle first when they steer.
The back wheels alway's follow the front wheels and stay on the circle until they are forced off by steering of the front wheels who wil go follow another traject. If this is another turn, you have to redraw the circle again.
A steering car is more complicated than you might think

Ok, I did some more thinking on this matter.
The above is not complete corect and only work on a wide turn.
Place the front wheels on that circle
The center of the axe is on the crosing point of the spoke and the circle.
Since the front wheels steer, they wil follow a circle.

Now the rear wheels wil take a "short cut" becouse they dont steer and therefor wont follow a circle but more a eclips. However they follow the front wheels.
The shorter the turn, the more they cut off.
Remember when you steer tight around a corner, you feel the rear wheels go over the curb.

There is actualy much more to it, like the Ackerman principle. But I think it gets to complicated for a poser animation

I am not a complete idiot, some parts are missing :)

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