On 25/06/2018 18:47, T i m wrote:

8

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

Yeah, something we would all know, watching the speedo whilst driving
on flat tyres. ;-)

Do you think he has worked out that tyres aren't flat even when at zero
pressure if the wheel is spinning. Maybe he has never swung a weight on
a bit of string?