"dennis@home" wrote in message
...
On 29/06/2018 11:29, Andy Burns wrote:
The Natural Philosopher wrote:

Surprisingly low.

255/35R19 tyres, so not very "tall" to start with.

But greater than the % RPM change you measured isn't it?
1.5% instead of what you measured...0.4%.

Yep.


It might be but unless you can measure it under the dynamic conditions it
is just a guess.
I think it would be hard to get an accurate measurement while driving

Not really, shouldnt be hard to have a laser mounted
on an arm outside the car, from the roof rack

and a rolling road isn't going to help either.

Correct.

I don't suppose you have a laser you can exactly centre on the wheel and
suspend a measure down from the wheel arch with a slow mo camera to record
what actually happens? Not serious BTW.

It wouldnt be hard to do.