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Re: Wheels and Tires
Posted by Andrew J Huang (more from Andrew J Huang) on Fri, 3 Dec 1999 11:19:16
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

I claimed:
  >>length of patch grows proportionately, so the entire patch is roughly
  5% longer and 5% wider.  This is a 10% increase in contact patch.
  Is this analysis reasonable?<<

and you correctly pointed out:
  >No. The area of the contact patch is equal to the weight on the tire
  >divided by the tire pressure. With no change in tire pressure, if you put
  >on wider tires, the contact patch grows wider, but it also becomes
  >shorter.

But you also lower tire pressures when going to larger tires.  Tire
pressures are correlated to the loading on the tire (i.e. car weight)
and their size to achieve the tire manufacturer's designed contact
patch.  An extreme example is my Lotus Europa using 175/70x13 (very
old car and size) that has factory recommended tire pressures of 18
psi.  The Europa has a laden weight of about 1500 lbs.

-andy

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