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During a measurement ride with my son today I got a flat rear tire at just before the 4-mile mark of our 8+ mile measurement. We were scheduled to go through the Detroit/Windsor Tunnel at a scheduled time when they planned to shut the whole thing down for us. Since we didn't want to miss that time I decided to continue the measurement with the totally flat rear tire. I was a little concerned about how it might affect the measurement, but decided to chance it.

After the measurement we looked at the numbers. For the first 4 miles with my intact rear tire, our measurements differed by 1.8 meters. For the next 4 miles with my rear tire flat, our measurements differed by 2.0 meters. Both times my son was shorter.

Before this unplanned experiment I would have thought that a flat rear tire might change the way you ride enough to affect measurement numbers. But at least in this case any such effect was trivial.

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I got a flat rear tire on a group measurement of the Olympic Trials course in Columbus. I had to be careful riding on a flat but Pete Riegel who crunched the data for the group informed me that that for that segment of the race, my ride was the shortest.

Apparently you would never choose to ride on a flat, but it doesn't seem to effect the quality of the measurement.

Had a rear flat in 2017 after some early morning measuring. Had calibrated at 22,927 cts/ mile. Rushed home,  pumped it up, tried it on street.  It was a moderately fast leak.  Went to cal course, repumped rear and rode.  It was 2/3 flat when I finished but the recal of 22,899 was quite reasonable considering temps and a 120 lb pneumatic front.  

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