On Mon, 25 Jun 2018 16:16:44 +0100, Tim Streater
wrote:

In article , Andy Burns
wrote:

Tim Streater wrote:

One revolution of the wheel has to equal one passage of the tire's
circumference along the road (since the tire does not slip around the
rim and assuming no slip on the road). How could it be otherwise?

Talk of "effective radius" is not relevant.

So are saying the circumference remains constant, hence the rpm remains
constant, hence iTPMS cannot work?

The steel cords may stretch a little, but that's all.

They don't stretch, they *move*, along with the rubber.

Without that, the
circumference *must* stay constant.

What's that ... is the penny slowly dropping? ;-)

Cheers, T i m