Old 02-22-19, 07:24 PM
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Join Date: Jun 2006
Location: Woodbridge VA
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Bikes: Cannondale Super Six; Cannondale CAADX

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My FTP is roughly 25 watts higher outside. I am not sure why this is, Ive never found a convincing explanation. The most obvious is that you donít have air flowing over you when youíre riding indoors so tend to overheat. But I have a large fan blowing on me that keeps me cool so that is not the problem in my case. Another theory that I have read is that when riding on a trainer indoors you donít have any momentum and your wheel will come to a dead stop as soon as you stop pedaling. Riding outdoors, your bike maintains momentum even if you stop pedaling. That explanation doesnít make sense to me either because it seems that power is power and momentum would only seem to be relevant if youíre trying to maintain a certain speed at a given power. Having heard no good explanations, I just accept it and train with a lower FTP when Iím indoors.
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