On Mon, 25 Jun 2018 18:16:53 +0100, The Natural Philosopher
wrote:

snip

There are no substantial changes. Ther is a very small change due to
elsatyicity of the tread belt.

Ooo, we have belts that stretch, belts that shrink and now belts that
are 'elastic', we are getting there just very s l o w l y.

You know this is true otherwise speedos would
be massively variable with tyre pressure and wheel loading
They are not.

'Massively'? Who is talking massively on any of this (apart from them
being good weasel words).

Cheers, T i m