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Rotate Wheel

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I'm trying to build an animation where a wheel rotates based on the path of the axis, axis in this case being a simple primitive although, I don't know how to get the wheel to follow the axis and rotate based on the velocity of the axis (cube) ?

I have the path for the cube but stumped on getting the wheel to follow the cube and to rotate.

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For the rotations you take (PI * radius)**2  and add that to the translation. You'll probably want to convert from radians to degrees. So for a circle translating in X and rotating in Z you could put something like this in the Z rot parameter...

-deg(pow($PI * (bbox(opinputpath(".", 0), D_XSIZE)/2), 2) + ch("tx"))

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