Aeroweenie.com has posted a large dataset of rider speed vs rider power (see
here). From this it is fairly easy to plot speed vs power and excel will even give you the formula
Here it is
Rider Speed in KPH = 14.67 Ln(watts) - 42.4
So now, assuming average weight, CDA, temperature etc you can easily calculate your predicted speed!
ps.
If you know a lot more variables then more accurate speed prediction calculators are available! http://www.aeroweenie.com/calc.html
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