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Thread: Cadence Formula

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    Cadence Formula

    Given

    gearing (48 x 16)
    wheelsize (700 x 23c)
    and
    speed (say 20 mph)

    what's the formula to calculate cadence? (assuming it can be derived this way)

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    At www. analyticcycling.com you can find this answer, and many other answers to questions like this.

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    This should be good for a laugh. This is how a math-impaired musician approaches it:

    48x16= 81 inch gear (assume 27" wheel), x pi = 21.195 ft. developed gear.
    21.195 feet is .0040142 miles
    20 miles divided by .0040142 miles = 4982.3 pedal revolutions, divided by 60 minutes = 83 RPM

    Howd I do?

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    Quote Originally Posted by neilG
    This should be good for a laugh. This is how a math-impaired musician approaches it:

    48x16= 81 inch gear (assume 27" wheel), x pi = 21.195 ft. developed gear.
    21.195 feet is .0040142 miles
    20 miles divided by .0040142 miles = 4982.3 pedal revolutions, divided by 60 minutes = 83 RPM

    Howd I do?
    We have a winner! analyticcycling.com says 84 rpm.

    Vanna, tell Neil what he's won!

  5. #5
    One speed: FAST ! fordfasterr's Avatar
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    I made this one a while back.. if you view the page source, you can try to make sense of my program.

    =)

    http://fixedgeargallery.com/articles/steve-cadence/
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    http://www.fixedgearfever.com/module...name=Downloads

    There is a spreadsheet called: GearSpeedAdvancedWorksheet.xls

    Whoever put it together covered all the bases. If you want to see the formulas rather than the results, you do the following keystroke combo: CNTL + ` (that last character is the farthest left most upper key on a standard PC keyboard).

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