poor power measurement Drivo II / Quarq Red Dzero

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tomvi
Posts: 2
Joined: Sun May 05, 2019 9:55 am

poor power measurement Drivo II / Quarq Red Dzero

Postby tomvi » Sun May 05, 2019 9:58 am

Hi, do you have any experience with the Elite Drivo II trainer and also with the bike that is equipped with a power meter? Elite everywhere says their accuracy of power measurement is +/- 0.5% but I still have a difference between Powerball measuring on a bike (Quarq) and measuring in a trainer about 20W. Of course, calibrations are done, tested on the app from Elite and Rouvy several times, lengths of a training min. 1 hour.
Thank you for any comments. Tomas

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Elite Admin S
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Joined: Tue Nov 08, 2016 10:18 am

Re: poor power measurement Drivo II / Quarq Red Dzero

Postby Elite Admin S » Tue May 07, 2019 12:42 pm

Hi

It's good to remember that the measure of some power sensor may be different from the one done by the trainer because of the lost of power on the transmission (expecially on the chain). This is true expecially for pedal power sensor on anterior crown power sensors (as our trainers measure power on the hub)In some cases the power lost may be up to a 5%.

I'll link some external sources:

https://www.dcrainmaker.com/2018/12/how ... ssues.html
https://www.bikeradar.com/news/friction ... fficiency/
https://www.ceramicspeed.com/en/cycling ... -friction/
https://www.cyclingpowerlab.com/Drivetr ... iency.aspx

tomvi
Posts: 2
Joined: Sun May 05, 2019 9:55 am

Re: poor power measurement Drivo II / Quarq Red Dzero

Postby tomvi » Tue May 07, 2019 1:10 pm

Hi Admin, thank you for your reply. I know, that measurement can be different, but i have 20W on the 200W average power. I have new bike, on the sram red etap, with clean and lubricated chain. If power lost will be 5%, ona 200W average, you can lost 10W, BUT not 20W.
I've read many tests where the difference between a wattmeter on a wheel and watts from DRIVO 2 was 3 to 5 watts. Also in this forum are users who have the same results both on bike and on Drivo 2.

I bought DRIVO 2 because it is reported to have a measurement accuracy of + - 0.5%, but I measure with 10% error which is unacceptable.

Tomas


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