SRM Powermeter on Zwift

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bas
Posts: 207
Joined: Thu Jun 30, 2016 3:58 am

by bas

Hi all- I have 2 SRM power meters on 2 different bikes. I use a 4iii HR strap as a bridge to Bluetooth. The IPad I run Zwift on connects and reads the powermeter data, the only problem is the numbers are way out- like if the Kickr is reading 200W, the SRM data is 250W. I’ve also connnected my head unit and the power on that is accurate, but at the same time the power on Zwift is miles too high. Is there some trick I’m missing?
Thanks


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kulcha
Posts: 45
Joined: Mon May 21, 2012 4:55 pm

by kulcha

I read somewhere some times ago that SRM transmits raw data, PC8 is registered with slope and offset, so the raw data is processed and power will be displayed accurately.

I could be wrong and will be happy if someone can correct me on this ;)

Anyway, RideOn!

ghisallo2003
Posts: 762
Joined: Mon Jan 02, 2006 7:10 pm

by ghisallo2003

Have you got access to another PM? It sounds like one of the units is wrong.

Do you manually offset the SRM?

bas
Posts: 207
Joined: Thu Jun 30, 2016 3:58 am

by bas

The PM units are fine. If I connect to Zwift and the Garmin simultaneously the Garmin will more or less match the kickr power but the reading on Zwift from the SRM is way out. There is obviously something in the way the SRM transmits the data to Zwift that isn’t working. I was hoping there is a setting somewhere that I’ve missed.


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