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Originally Posted by sanddrag
For a rigid wheel (non deformable tread surface) a wheel contacing the ground plane will give you a line whereas a hemisphere contacing a plane will give you a point. This may be cause of concern in the traction department.
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Or it might make things better. It depends on the surfaces involved. If the playing field has a clean metal surface, metal wheels might actually be a good bet. Metal on metal actually results in a very high coefficient of friction and a small contact area enhances this. That was a key principle in the CVT that 190 did a few years back. We also used in on our slide drive in 2004.
However, if we are back to the standard carpet then the line contact would probably be better. Because of the carpet, not the wheel.