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Reply to "Pre and post calibration variance"

The difference of 46 counts per kilometer between the pre and post calibrations is much greater than I have ever had measuring. If I experienced this measuring, I would assume something was wrong. I would discard my measurements, check my bicycle and start over.
The time from 8 a.m. to 5 p.m. is much greater than I have ever allowed between pre and post calibration rides. When I have bicycled a half marathon for certification twice in a day, I have calibrated my bicycle between the two rides. That is three calibration rides; but if I have a flat tire the second time bicycling the half marathon, I wouldn't loose the first measurement. I can bicycle a 10 K fast enough to do it twice between pre and post calibrations.

I would use the larger of the WC and FC or use the average of the two.

Dale Summers
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