On 25/06/18 12:04, 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?


No, we are saying that te circumference remains *nearly* constant, and
the difference is due to belt shrinkahe under lower pressure NOT
'reduction in radius' and is of the order of less than a percent for up
to 10% reduction in 'radius'

Has to be so or flat tyres would give *way* out speedo readings


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The New Left are the people they warned you about.