Zero or very low power during Downhills/descents

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livestrong13
Posts: 13
Joined: Sat Oct 31, 2015 10:23 am

Zero or very low power during Downhills/descents

Post by livestrong13 »

Hi,

I recently purchased the Newton Ibike 5+.

I did the first calibration (5min) and the 10min calibration ("Best accuracy" choice) with my profil configured in Isaac Software. All seem to be correctly done.

I have a question after my fisrt ride with the Newton. The Watts display is good and power responds well to the ride profile (uphill, flat, slight uphill and dowhill sections...)
However, i noticed that the power was to 0 Watt or very closed at very low power values for downhill/descent sections (-5% or steeper % slopes), despite the cadence isn't to 0 rpm and my pedalling constant. (The cadence sensor works well, i have my garmin computer also attached on my bike and the values are consistent with my pedalling).

I have to put a lot of force in my legs and/or to increase my cadence very high to reach a higher speed and so an acceptable or very low power value.

It is a normal performance from the Ibike Newton? It seems to be normal and logical (gravity influence, so it's difficult to have the same power as well as on flat or uphill sections) to have lower power values for downhill sections but i have doubts. I did'nt expected, from time to time, to have a 0 watt display.

Thanks in advance for your feedback.
Velocomp
Velocomp CEO
Posts: 7793
Joined: Fri Jan 11, 2008 8:43 am

Re: Zero or very low power during Downhills/descents

Post by Velocomp »

Please post a ride file showing the issue
John Hamann
livestrong13
Posts: 13
Joined: Sat Oct 31, 2015 10:23 am

Re: Zero or very low power during Downhills/descents

Post by livestrong13 »

I have posted you all documents i could, my first ride, the ride cal (which seems to be perfect with the "Check calibration" in Isaac, see attachment) and the position of my Newton on the bike.

Maybe all it's ok and the Newton behaviour and calculation are normal. I had just a doubt concerning the lower or 0W power values in downhill/descent sections even if i kept a constant pedalling.

What do you think so?
Attachments
cal ride-min (1024x528).jpg
cal ride-min (1024x528).jpg (247.48 KiB) Viewed 3296 times
iBike_10_31_2015_0859_30_Miles_HiDef.ibr
(979.54 KiB) Downloaded 237 times
iBike_10_31_2015_0732_3_Miles_CalRide.ibr
(130.86 KiB) Downloaded 223 times
livestrong13
Posts: 13
Joined: Sat Oct 31, 2015 10:23 am

Re: Zero or very low power during Downhills/descents

Post by livestrong13 »

More photos
Attachments
WP_20151103_17_21_55_Pro (575x1024).jpg
WP_20151103_17_21_55_Pro (575x1024).jpg (249.91 KiB) Viewed 3296 times
WP_20151103_17_20_30_Pro (1024x575).jpg
WP_20151103_17_20_30_Pro (1024x575).jpg (305.43 KiB) Viewed 3296 times
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