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Reply to "When to calibrate"

What about using the on-site check? Then, if there are extenuating circumstances, the post-cal can be waived?

Do the proper pre-measurement calibration. Go to the course, and, before measuring, set out two pieces of tape, 300 feet, or so, apart (100 meters for you metric-heads ;-) ), or a round number of counts about the same distance apart. Ride it at least twice. Do the measurement. When finished, ride your two pieces of tape at least twice. If your counts are the same, you didn't lose air, or heat the tires too much.

This tells you that your post-cal should be good. You still do the post-cal, but if it is raining, or whatever, you have at least confirmed that your ride was good, which should make the post-cal unnecessary.

Feasible?
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