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You live and learn! You are dead right - the crank rotation was measured on the day and came within the allowance, which turns out to be 18ft 10 inch & a quarter. On the day I was too shit scared to notice!
Thanks for pointing that out, @jsabine!
General_Lucifer
A pedant writes:
Not quite - a 72in gear is equivalent to riding an Ordinary with a 72in diameter wheel, so one revolution would be 72*pi=226in.
That doesn't flow as nicely though ... really liked it anyway.