I have to start off by saying that Nicolas at P2M is awesome!!! Their customer service and response time is untouchable.
Thank you Nicolas!!
My question is around power readings compared to my Tacx Fortius trainer. I do not expect the two power readings to be exact, but I did hope it would be closer than 10-20 Watts apart.
My new P2M is reading 10-20w less than my trainer. Is there a calibration I should be aware of?
It is also worth noting that my P2M power was all over the board while my Tacx was reasonably steady.
I calibrated my Tacx before I started and then warmed up. I even stopped a couple time to let my P2M auto-cal.
My cadence is spot on.
Any words of wisdom?
I switched from a powertap to power2max. I found similar results as described above...
I did two tests where I used the powertap and power2max. Overall the power2max was 8 watts less. On a trainer with a Kurt Kinnetic road machine, in a specific gear at a specific cadence... I found my powertap watts to be very steady throughout a ride. With the power2max, I found for the first 20-30 minutes the watts to jump around a little bit after a calibration. When I would notice it to be a little high or low, I would not peddle for 2 seconds and let it recalibrate. It seemed to steady after 20-30 minutes.
Another issue, after a hard interval, I will stand up to stretch my legs, I found this could really screw up the calibration. Especially if this is in the first 20-30 minutes of a ride, I have seen my watts jump 15-20 watts. So anytime I stretch, I sit and calibrate again and be careful to keep my feet still and light.
I have now gotten the hang of calibration, but I'm not thrilled with how it works. I'm finding myself paranoid and thinking about my pauses/rests and if I'm screwing it up.
I have had a couple instances where the power stops for 5-10 seconds also.
Can you give any insight on how it calibrates, what might potential screw it up?