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Old 02-28-06, 02:49 PM   #1
eat_raw
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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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Old 02-28-06, 04:10 PM   #2
WarrenG
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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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Old 02-28-06, 06:02 PM   #3
neilG
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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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Old 02-28-06, 08:28 PM   #4
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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!
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Old 03-12-06, 04:22 PM   #5
fordfasterr
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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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Old 03-26-06, 09:34 AM   #6
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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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