Originally posted by: tagoma
Originally posted by: ppauper
Manchester (UK) marathon too short by 415yds for three years as 24,000 runners have times invalidated
26 miles 385 yds less 415yds is what, 25 miles 1730 yds
blamed an incorrect calibration of the bicycle wheel that is used to measure out the course by an accredited measurer
What? Can't they double-check ... eh ... eg using a second bicycle wheel or a 21st century measurement tools?
many years ago, I used to know someone whose hobby (for want of a better word, his day job was school teacher) was certifying courses, and he used to tell a story of how he helped measure Boston. It wasn't just him, a group of them did it together, and they competed to see who could get it tightest. If they came across a parked car, they would get off their bikes, lift them up, ride past the car, then lift the bike up again to get back to the curb. The first year he was involved, he claimed one of the elite runners said something like "that course must have been a quarter mile longer than it was last year," and indeed it was because they measured it much tighter.
They're supposed to calibrate the bicycle by riding it over a known distance (100m on a running track for example)
There's also a stretch factor of what 1% in the US, so that the course as measured has a length of (26 miles 385 yards)+1%, or (26 miles 846 yards)