While reading a back-issue of Red Bulletin Magazine. I came across an article on F1 tyres in the wet.
It has a few calculations which, to be honest, mean absolutely nothing to me. However they and what was written may be of interest.
The link is >
here<
The pages you're after are 24 and 25.
"It could be done manually. It would take quite a while, but it could be done. There is however a much more efficient and accurate way of getting the data. Men with lasers." Wing Commander Andy Green