I’m trying to work out what my ‘actual’ FTP is. Now, I know the answer is ‘it doesn’t matter’, but I’m just curious.
The background: I had my first FTP number (259) in April of this year using the dual-sided powermeter (Ultegra) on my Giant TCR. I used the Coggan test (warm up, hard 5 mins, 10 min spin, 20m flat out), and rode outside.
When I sold that bike a few weeks later, I put a stages left crank meter on my new bike (a Mason Definition). I always felt the Stages underread relative to the TCR (not saying it was wrong, just different) and my first FTP test with it after a successful block of training was 248. Not that it’s terribly scientific, but I’d got quicker on all my regular Strava segments during that time.
I have had issues over the last couple of months with power ‘drifting’ downward on the Stages – i.e. power averages trending downwards over time despite faster average speeds. Whenever I recalibrated it, the first ride or 2 it would always massively overread (suggesting ludicrous numbers like 280w at a moderate spin in a middling gear) so it went back to the shop 2 days ago for them to look at and if necessary warranty.
Anyway, to get to the point: I did a ramp test last night using the power readings from my Tacx Vortex for the first time. I’ve always avoided using this power source because of its reputation for inaccuracy (and used the stages instead).
Also relevant: it was the second time I’ve been back on a bike after having Covid (though CV19 was very mild for me).
Here’s the result:
I would LOVE this to be true, but I suspect it’s overstated. I do not think I’m a 4w/kg rider.
The question is: how much is it overstated by?
For reference/context, I weigh 77kg and am 38. I’ve been cycling 25 years and was a very good CX racer in my late teens and a decent (but nothing spectacular) time triallist in my early 20s. I hardly rode at all between 25 and 35, and while I have ridden regularly again for a few years, I’ve only been systematically training again for about 9 months. I typically average about 29-30kph riding on my own over fairly hilly terrain for 60-80km. I can just about hang with the A group on (infrequent) club rides, but I’m really working not to get dropped.
Any thoughts/guesses appreciated.
I have my own guess but I’ll keep it to myself until some others have chimed in!