http://bikecalculator.com/veloUS.html
I always thought the online bike calculators were pretty accurate. Now I wonder. Today I did 40 minutes of high tempo riding, 234 watts averaging 21.8 mph. No wind, flat terrain. Plugging in the required parameters (158lb rider, 15lb bike, hoods, clinchers) in two different bike calculators both say it would require 264 watts to average that speed. Can anyone explain why a 30 watt discrepancy between the calculator and my PT? Is it more likely my PT is off or might the calculators be in error?
I always thought the online bike calculators were pretty accurate. Now I wonder. Today I did 40 minutes of high tempo riding, 234 watts averaging 21.8 mph. No wind, flat terrain. Plugging in the required parameters (158lb rider, 15lb bike, hoods, clinchers) in two different bike calculators both say it would require 264 watts to average that speed. Can anyone explain why a 30 watt discrepancy between the calculator and my PT? Is it more likely my PT is off or might the calculators be in error?