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Reply to "Tire footprint"

I don't know much about tires or how their sizes relate to each other but your Samba piece has me confused. You refer to footprint...that would be the area of rubber on the road measured in square inches ? Your second sentence includes the word ....measure....  Do you mean to really say  .....compare....in this case instead ? How can the depth ( or height ) of the sidewall relate to the "length" of rubber on the road ? Tread width is obvious. Your method of comparing one tire to another is consistent but again I can't see how sidewall height relates to the length of the rubber on the road. Thanks. ( stunned in Ottawa )  

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