AeroPod, PowerPod and Newton

Is there any reason to do another calibration for this season? My weight and bike setup are they same as last spring when I last did a calibration.
Does anything in the electronics drift over time that warrants a re-calibration from season to season?
Thanks

No need to recalibrate.

As I lose my winter weight (optimistic) and also ride more in shorts and short sleeves, should I also re-calibrate or just adjust my rider weight? My calibration ride was done with vest, arm and leg warmers and if I drop 4-5 lbs from that point is that enough of a change to re-calibrate? Thanks.

Hi Thooey,

I will take a crack at your concern.

The calibration ride sets two things, the tilt offset with you on the bike in your normal position and the air pressure sensor offset for it's position in the airstream around you and the bike. The airstream position affects the pressure that the iBike senses because of airflow dynamics - think higher pressure areas of compressed air flow over the surfaces.

The weight you change will only marginally change the tilt normally, probably not even measurable besides the iBike now corrects that on the fly and saves it new correction at the end of a ride with the reset.

The aero dynamic drag change for your clothing makes a slight difference and can be set with coast downs, which are where this is teased out of the data along with rolling resistance. Velocomp has gone to some lengths to make the need for coast downs unnecessary. I find the biggest difference clothing makes is if I wear a baggy windbreaker and especially if it is not totally zipped up. So if you used the estimation process, you could take a look at that and tweek the cda value a bit in your profile or do new coast downs.

Just a few thoughts on the matter,
Hope this helps.
Russ

Russ, thank you, that helps explain it for me.

Hello,
I have another question about re-calibration:
Two weeks ago, I raise my handlebar 2 cm higher.
Since this change, it seems that ibike give numbers higher than previously, on the same circuit and the same wind conditions.
For example, the power output was 194 watts (vs 199 against a DFPM) before the change, and now Ibike output is 227 watts (no DFPM numbers). Heart Rate data were comparable and speed too.
Do you think I need to Re-calibrate the newton with this new position of the handlebar?
Thank you.

Whenever you move your Newton in a way that changes either its angle on the bike, or its position in the wind, it will require recalibration.

Many Thanks for your quick reply

Velocomp wrote:Whenever you move your Newton in a way that changes either its angle on the bike, or its position in the wind, it will require recalibration.

Just to check, I have a RWS mounted (with which I performed the calibration ride a couple of years ago) which I now want to remove. Am I right in saying I dont need to perform the calibration again if I now remove just the RWS but keep everything else just the same?

Thanks

Removing the RWS is the same as changing the position of the Newton in the wind, so you should do a new calibration ride.

Velocomp wrote:Removing the RWS is the same as changing the position of the Newton in the wind, so you should do a new calibration ride.

OK Will do, thanks John