I have a Stages left crank power meter on my bike. I use a Watt Bike at the gym (when it’s open) and a Saris H3 smart turbo trainer at home.
On the Watt Bike the TR Ramp Test gave me an FTP of 256w, on the Saris I get an FTP of 218w on the same Ramp Test and when I cycle outside I am holding powers of 352w for nearly 8 minutes (which I wouldn’t get anywhere near on the Watt Bike).
So basically I appear to have 3 completely different powers and FTPs. I would understand a small difference but these are huge.
All devices have been calibrated multiple times and all state that they are within a few percent of being accurate.
I wouldn’t mind so much but I would like to use TR for indoor and outdoor training but this isn’t possible. Indoors I would really struggle and score an RPE of 8-9/10 and outdoors I would sail through the same workout with an RPE of around 4/10.
Also, I can’t record an outdoor segment and then set the smart trainer up to train me for that section…so frustrating.
Anyone have any ideas why these three appear to be so far out? Power is power so I assume it must be to do with calibration but all are calibrated, all have the latest firmware and the chains are looked after etc. Yes there is a difference in temperature between indoor and outdoor training but not alter my ability to this extent.
I’m tempted to give up on power and just train by heart rate (which I know has its own weaknesses) but what else can I do?
Thanks for any ideas in advance.