Quote:
Originally Posted by Jon Stratis
Of course, you are assuming the wall sits at an exact 90 degrees relative to the floor 
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Well no, they don't usually. But they're usually close enough for most purposes. I mean, if you have a 6WD with a center drop, then the frame isn't going to be properly parallel to the ground either. Which is a fun thing to consider. Frame perimeter is defined relative to how the bot "normally" rests on the ground, but what does that mean if it rocks?