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It's a bit of educated guesswork I find. I cobbled mine together from 20 min tests on a turbo and bests for normalised power over 20 mins and 60 mins out on the road on recent rides. As @danstuff said though, you need to take 95% of a 20 min effort.
The problem with 20 min tests is getting the pacing right. That's why I tend to prefer going off 60 mins outdoors and allowing for the fact that it's not totally full out due to traffic, freewheeling around corners etc
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How does everyone else here estimate their ftp?
Over the winter I do 20 minute efforts on track, and then apply the 5% reduction. Over the summer I use the results from my 25 mile TTs. I don't often get below the hour mark (twice so far) so I can get a 60 min figure from those.
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20min climb.
I do several all out 20min climbs a week. So while I may not constantly adjust my FTP. I do have a idea of my form.
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jim1985
Brommers
Smallfurry
@dilly
Cool, thanks. Interestingly, for the whole 72min my average was higher than my 60min... I guess that makes sense, going harder at the beginning and end must've bumped the total average up. Think I'll stick with 240w for now and see how that feels training.
How does everyone else here estimate their ftp?