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I’ve not done a 12 min test, but have done 8 and 20’s before. They all do the same thing - give a rough approximation of FTP, so long as you fit the bell curve average and aren’t an outlier.
Don’t worry too much about the number for now. Just ride with the power meter for a while, gathering a variety of data (max efforts at various durations) and keep testing every few weeks and you’ll start to learn where your FTP is.
I find a turbo much easier for FTP tests. It just takes away the distractions and means every test is consistent.
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You could try using the Xert "What's My FTP" widget for Garmin. I used it for a while to confirm actual FTP tests, and was surprised how close they were
TTM
TooTallTim
@jakemcree
I've just done my first FTP test following the one that comes already loaded on my Edge 830. Was a bit weird, thought it was supposed to be 20 minutes but think it was 12? It was a bit of a mess and ended up having a couple of cars pull out on me which fucked up my rhythm. Don't know how accurate it was.
Has anyone used the Garmin one? Did you find it accurate? Need a turbo I think...