isn't this just as likely to be the result of just blindly taking FTP as THE test of racing fitness as well? a 1 hr test is just, far too long to provide a proper indication of anaerobic work capacity (an extremely important component in the repertoire of competitive cyclists).. mightn't someone foolishly think they are truly prepared as well as they could be for racing, but in fact have a gigantic hole in their fitness and as a result their potential by only looking at FTP..? you are right and this is the point of my post.. taking 1 power reading for duration x is not enough to know where you are at... that's goes for 20min and even for power at another duration, even if it has a fancy acronym like FTP... otherwise known as 1hr maximal power.. but if i was going to take 1 test it wouldn't be 1 hr power, it would be 20 min power for the reason i gave in the previous post... it's practical because i do the all the time and it probably more accurately predicts all round road racing fitness but notice i routinely take power readings at two durations 10min and 20min (2 data points).. and also less frequently at 5min and 1min.. 15sec is also another reading i take note of.. these are all done in the course of my regular training though... and then i use monod periodically to extrapolate to other duration not typically found in my training (like 1 hr TTs)... doing this, by FAR, has more utility than just looking at FTP as the gold standard for racing fitness. and yet there is this intense fascination, obsession actually, with knowing this number, and knowing it to accuracy x,y,z... what's even more crazy is most will take that 20 min number to estimate the 1 hr number... if you are going to do that, why not just forget about the 1hr number and use the 20 min number directly? but some will say... well you don't really know it because you haven't done a real 1hr test... it's crazy!! i'm sitting here in my chair having a good belly laugh... and why not just use what you can historically do for a duration to guide the intensity you train at those durations for instead of some rough estimates of what those values should likely be that you find in a table online? yeah, yeah, yeah.. good for the newbie starting out, but why are people who have been riding with power meters for years doing this? FTP... if you can estimate it to +/- 5-10W that's fine.. outside of that... who the hell cares? and what of 15sec and 1 min, 5min, 10min, 20min or 67.5min power? why am i suddenly reminded of the Fight Club movie when i hear people talking about the intricacies of FTP...?