Originally Posted by
jfmckenna
My understanding is that the math formula used to get your FTP from a 20 minute test is supposed to be representative of what you should be able to do over an hour. But It doesn't seem right to me. The last FTP test I did on Zwift, on rollers with a power tap hub I averaged 330 watts for 20 minutes. But there is no way I could hold 300 for an hour. I've done a few A races on Zwift and I'm like dying at 3.5kg/w and I'm looking at everyone else around me at 4.5 and 5kg/w and then just watch them ride away in the virtual distance.
Perhaps doing a 20 minute test on the road would be more realistic IDK.
Nope.
20 minutes tells you your 20 minute power. Want to get the most accurate FTP estimation, you need to actually do something in the 50-70 minute range