Garmin Rally Single Sided Powermeter

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Terence Mac Donald

• January 11, 2022 09:29

hi

I recently installed my Garmin rally xc100 (single sided) power meter, after my first ride the results were in line with watt I expected, the second and 3rd ride were quite off in terms of data compared to the first ride some of the results nearly halved (!)

also some of the detailed power data seems to be really off see below screen-print where cadence, HR and speed are very stable power range shows stark peaks and troughs 

Already reconnected and performed calibration on the K2 several times.

Is there anyway you can explain these stark differences ?

data below, if you want I can share fit files

Jan 3rd ride

• Distance : 53.28 km
• 2:23 moving time
• 170 w weighted avg power
• 1.340 KJ

Jan 11th ride

• Distance : 53.58 km
• 2:24 moving time
• 95 w weighted avg power
• 657 KJ

 

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  Scott Patton

  • January 14, 2022 16:38

  Did you calibrate/zero torque before ride?

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  Bijit

  • January 24, 2022 21:08

  Hi Terence, thank you for sharing this post. We would like to investigate the issues with your ride.

  Could you please share the FIT file of your both rides with us at support@hammerhead.io?

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  Jon

  • March 13, 2022 04:43

  I’m currently playing around with my new Rally XC and have been getting low / inconsistent power. Some reading today pointed me toward the torque spec which I am going to try on my next ride. I had been putting them on the trainer and taking them off each time and probably not tightening them enough. Something to check if you haven’t.

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  Galeb

  • March 13, 2022 18:08

  Same here. I think it started with 1.264.1147. Before that I had no issues that I was aware of.

  MO before every ride: Get the bike outside for at least 10 min to adjust for the temperature. left crank 6 o´clock. Hammerhead -> sensors -> calibrate. 

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  Terence Mac Donald

  • March 14, 2022 12:53

  it might also be that your pedals need a firmware update, it did help reduce my problem a lot

   

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