Reply to "Cal course foot vs meter discrepancies"

peteriegelRCMBB Founder

Mike,

Here is what I hope will be some helpful corrections and advice.

First, your counter does not read in meters, or in feet, or in any other unit of length. Because of its gearing it records 23.636363…. COUNTS for every revolution of the bicycle wheel.

When you read your counter, the average reading was not 516.5 counts over the 1640 feet. It was 5165. I hope this is exact. It is a mistake to round off the number prematurely.

Your riding constant over the measured 1640 feet (499.872 meters or 0.310606 miles) will thus be: 5165 counts / 499.872 meters = 10.3326 counts per meter. For USATF road measuring the short course prevention factor of 1.001 must be applied, and the 10.3326 is increased to 10.3326*1.001=10.3430 counts per meter.

So, if you want to lay out a 10 km course you will need to ride 10000*10.3430 = 103430 COUNTS.

Since a mile has a length of 1609.344 meters, each mile you lay out will require 1609.344*10.3430=16645 counts.

6/25/102:56 AM

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