After thinking about it, I should have gone into tire traction more. In my last post I said that less weight on a tire equals more traction, well that's partially true. A better way to put it is it increases tire efficiency, for example (these are pulled from the chassis engineering book I talked about) if we have a tire with a 1000lbs load it will have 1000lbs traction available theoretically, so that tire can produce 1g of cornering force or it's 100% efficient. Now let's take the exact same tire and change the vertical load to 500lbs it will have 700lbs of traction available, well we can see that the lighter tire has less traction, 300lbs less, however we can see that the tire with the 500lbs vertical load will now produce 1.4g's or it is 140% efficient.


EDIT: here's a link to where this was pulled from, in the preview you can read pages 1-2 that covers tire traction vs load and will explain it a little better than I have

http://books.google.com/books?id=rY2...epage&q&f=true