Power very fluctuating so I did a calibration ride but...

[meste]

Hi, I need some help here as I have a feeling that something is wrong...

I am using the PowerPod with two bikes a street one (Scott Speedster 10) and MTB (Cube LTD Pro). Lately the profile for the road one is giving me very high fluctuations so today I did a calibration ride. It was some wind during the calibration ride so I would appreciate if someone could check the calibration profile attached here.

Main differences between previous calibration are:
Aero 0.620 before 0.362
Wind scaling 1.712 before 1.000

With the new calibration I am either getting higher overall Power values, but stable values during workout then I could see the day before. If I run Check Calibration on this last run I am getting a suggestion to change average power from 220W to 190W. So not sure what to do next. Maybe the fact that it was some wind during calibration ride was not good. I have also attached the profile and the run.

Note: I updated the numbers (I was looking at the wrong screen)

Thanks,
Serban

[Velocomp]

You have an out-and-back ride, with a long symmetrical section between minute 24 and 54. I adjusted your profile so that wind speed was the same in this section.

This dropped your watts some, but I think this looks good.

Corrected profile and ride file attached.

[meste]

With this one the average power drops from 226 to 173W, if you think this is ok, then I would use it, but I definetely felt more tired than this average...

[meste]

John, I remember reading somewhere that there is a button combination to start a Calibration Ride while out on a ride. Was I dreaming and there is only the procedure that has to be started from the computer?

[meste]

I found an old reply also from you in this forum: If you are using FW 641, you can most definitely calibrate on the fly, without using Isaac. You press-hold the button for 4 seconds, to do a new scan (make sure there are no other bikes close by). The scan will force PP into an O&B calibration.

thanks

[meste]

But I still have a question:

I go out on a ride with PP recording, Than I reach the place I want to do a calibration. As PP is still recording and do not want to wait till it goes automatically on hybernation, how do I stop the recording and start O&B calibration? This is where I am not sure.

[Velocomp]

I found an old reply also from you in this forum: If you are using FW 641, you can most definitely calibrate on the fly, without using Isaac. You press-hold the button for 4 seconds, to do a new scan (make sure there are no other bikes close by). The scan will force PP into an O&B calibration.

thanks

Correct

[Velocomp]

But I still have a question:

I go out on a ride with PP recording, Than I reach the place I want to do a calibration. As PP is still recording and do not want to wait till it goes automatically on hybernation, how do I stop the recording and start O&B calibration? This is where I am not sure.

Press-hold for 4 seconds. This will stop the current ride, cause a sensor pairing, and put PP into calibration mode.

[meste]

great. thanks.

[meste]

Hi John,

Today is a sunny with no wind day so I went out and did a calibration ride which came with these results:
Aero 0.366
Wind Scaling 1.000
CdA 0.366
Fric 11.212

The one that you amended it for me after that ride was:
Aero 0.439
Wind Scaling 1.212
CdA 0.362
Fric 11.158

If I apply this new calibration to my ride from yesterday, I will get even lower power values, for example PWR 20min drops from 283W (which was a way too high) to 193W which I believe is low (actually I am starting to question my feelings as well...)

I am not sure what to do, the power values are so different and was hoping that after today's calibration with no wind and sunny on a flat road with no traffic to finally solve this matter.

What would you suggest me to do?

Thanks (attached todays calibration profile)
Serban

[Velocomp]

Please post .ibr ride file

[meste]

Today I simply went home after the calibration so not much a ride, but I have attached.

[Velocomp]

Your measured profile is very, very close to the corrected profile I gave you.

Your measured profile is fine.

[meste]

Thanks John