There was a short discussion on the Wattage forum about deriving FTP from NP60. What are your thoughts on this? My best 20-min test result was 235watts, 95% of which gives me an FTP of 223.25W. However, on one of my training rides where I was really hammering it, I got a normalized power of 235w for a 1-hour time period, with a VI of 1.09.
223.25 watts from the 20min test (done indoors on a trainer)
235w NP for 60 minutes hammering outdoors, VI of 1.09.
Which is more accurate/reliable?