Healthy and active
Join Date: Mar 2007
Location: Caldwell, Idaho USA
Bikes: mid-60's Dunelt 10-speed, Specialized Allez Sport Tripple, Trek 7.2 FX
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If you simply want to know your cadence, there is a formula you can use. When you are pedalling at the cadence you want to know, note the gear you are using. How many sprockets from the outside on the back and which chainring on the front? Note your speed. After your ride multiply the constant 336 by your speed in miles per hour and divide by your gear in inches.
As for converting a spedometer to measure cadence, it would seem an unlikely possibility. I am guessing, though. You might be farther ahead to start fresh with a reed switch for a sensor and an IC counter chip you can configure for events per minute. You would need to make your own case and mount. It could be fun, but would be involved.
Many say they used a cadence measuring spedometer for a while and later learned how to judge their cadence from experience. After a time they no longer used the cadence readout on their spedometer.
Last edited by twobikes; 05-31-07 at 12:03 PM.