Scott Goelzer figures a percent-tread correction. This does not make
sense to me. The air in the tire is not just pressing against the tread
portion, it is also pressing against the inner surface of the tire
between the tread. The force from the between-tread air pressure is
transmitted to the tread through the stiffness of the rubber and the
belts. If it were not, the between-tread rubber would be pushed between
the tread until it also pressed on the road. I would think you want to
use the total contact patch area without any tread correction.
Michael D. Edmiston, Ph.D.
Professor of Physics and Chemistry
Bluffton University
Bluffton, OH 45817
(419)-358-3270
edmiston@bluffton.edu
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