Roy McNeill wrote in a message to Bob Lawrence:

> On (13 Sep 98) Bob Lawrence wrote to Roy Mcneill...

RM> This is the exact argument I'm using to say that tyre pressure
RM> doesn't affect speedo readings. If one revolution of the
RM> circumference on the road covers the same linear distance,
RM> regardless of the shape of the tyre, how can pressure affect the
RM> speedo?

As those who have defiled the classic Greek ideal of science have found,
your question needs to be "As pressure affects the speedo reading, how
can the `circumference on the road' [whatever that gobbly-gook means -
you'd need a rather curved road to get such a thing] cover the same linear
distance?".

There is a short and simple answer to your long and simple question.

Terry

---