[gorrilla]

Originally Posted by EricH

Ah, stability? Again, not determined by surface area. It's determined by some other things, like CG and wheelbase.

Let's say you have a rectangular robot at max dimensions, with the wheels (or treads) a little bit inside the max. It looks like this:
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That's the wheelbase as seen from the top. As long as you keep your CG above that area, you won't tip. As soon as the CG goes outside that area, you've got a split second to get it back before the big crash. If you have treads, you'll still have the same area.

ah, wheelbase(couldent think of the word for it) thats what i meant......

i never implied that they were going to be wider than a wheel..............

there like this
http://www.chiefdelphi.com/media/photos/28106

except flat