I’ve been training indoor/outdoor and racing for a while now and I don’t remember when was the last time I did an indoor FTP test that resulted in an increment on my figures. In fact I think that all my PBs have been done while racing, after uploading your activity you receive an email from TP telling you that an FTP increase was registered, always makes me smile. Of course, a new FTP while racing makes you wonder what would the real FTP be If you did not have all those miles of racing before you set your new best 20min power. Anyways, that’s how I’ve been keeping track of my FTP.
I have a quarq elsa on my road bike, a quarq Dzero on the gravel bike and an SRM on my MTB. The three of them give very similar power readings. On the other hand, my wahoo kickr '16 always seems to be way off… around 30w less. It was until recently that I found out about the Power Match option in Trainerroad (I don’t know if Zwift offers something like this) but before that I found myself training indoors “in the dark” regarding which FTP to use since it definitely felt much harder to move the 310w FTP that my training peaks suggested. I had two factors against me, 1: the fact that I always feel stronger outdoors and 2: the different (lower) reading that my kickr showed. This was a bummer since the whole point of buying all this equipment was precisely to train as accurately as possible.
So, to round up my questions:
I know it’s not just me who feels stronger outside, is there any reason for this other than the psychological aspect of being outside? (I’ve thought about the fact that the bike is fixed, this might alter the result). Is there some sort of handicap you can consider in order to pick the right FTP to train inside, lets say a 10% decrease in the FTP when training inside?
Is my kickr '16 defective or are everyone’s kickr readings about 30w lower than their other powermeters? Is there any way to override this within the kickr hardware so I don’t have to rely on the Power Match option which I only know it exists in Trainerroad?
Thanks in advance,