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The “play” you’re observing has no effect in the long term. The gearing assures us that the right number of counts will be recorded based exactly on the number of rotations of the bicycle wheel. Having said that, we still have to be concerned when recording counts, particularly at the end of each pass on the calibration course. Make sure that, while reading, your last movement was forward. This is covered in the Course Measurement Procedures manual in the section, “Performing the Calibration.”

Alan Jones
3717 Wildwood Drive
Endwell, NY 13760

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