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Old 04-08-07, 08:05 AM   #1
phlegmon
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20K watt/speed/time chart please?

I came up empty on google and bike forums for a search for a chart of times for different watts for a 20K time trial (assuming flat course). If anyone has one, or could post a link, I would be deeply grateful.
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Old 04-08-07, 08:16 AM   #2
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You won't find one. If you're facing a 20mph headwind the entire time, then 400 watts will get you a slower elapsed time than if you had a 20mph tailwind.
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Old 04-08-07, 08:24 AM   #3
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Quote:
Originally Posted by phlegmon
I came up empty on google and bike forums for a search for a chart of times for different watts for a 20K time trial (assuming flat course). If anyone has one, or could post a link, I would be deeply grateful.
You can work it out for yourself here http://www.analyticcycling.com
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Old 04-08-07, 09:02 AM   #4
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25min 20k TT from a 130lb guy is going to have a much lower avg. wattage than a 25min 20k TT from a 190lb guy. Cadance will be another factor and as bdcheung said wind, road surface, position to many variables to make a one size fits all chart.
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Old 04-08-07, 10:59 AM   #5
phlegmon
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Well are there any sort of 'average' charts to view, just to get a feel for it? Like a 70kg rider with no wind and flat course?
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Old 04-08-07, 11:28 AM   #6
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Quote:
Originally Posted by phlegmon
Well are there any sort of 'average' charts to view, just to get a feel for it? Like a 70kg rider with no wind and flat course?
what's the point. there's always going to be some sort of wind and nothing is perfectly flat. the only way you're going to know your power is with a powermeter. anything else is just a guess.
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Old 04-08-07, 11:48 AM   #7
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Quote:
Originally Posted by phlegmon
Well are there any sort of 'average' charts to view, just to get a feel for it? Like a 70kg rider with no wind and flat course?
yes, i have seen the graph that you are talking about. i think it was in an older cycling book that i read. i cannot verify the accuracy of it. as someone said earlier, online calculators are pretty good for "getting a feel for it."

http://www.kreuzotter.de/english/espeed.htm

- this one seems to give high power numbers, not sure i believe it.

http://www.analyticcycling.com/ForcesPower_Page.html

- this one seems to be more accurate, or at least people seem to put more stock in this one's credibility.
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Old 04-08-07, 11:51 AM   #8
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I'll go ahead and throw out a number.... 290 watts. Give or take 50 watts.
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