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Backward Power Datafield


**** CAUTION: STILL IN BETA PHASE. PLEASE DOWNLOAD ONLY AFTER READING AND UNDERSTANDING POSSIBLE ISSUES DESCRIBED BELOW. ****</p><p></p><p></p><p>Have you ever wondered how much your legs are braking your forward movement on their upstroke ... and found no good answer in the torque efficiency percentages from your power meter?</p><p></p><p>This data field shows you the unintended backward (or negative or lost or braking) power during the upstroke - in Watts! (This is probably the same as what is called Gross Power Absorbed (GPA) in Training Peaks / WKO4.) </p>

What’s New

v0.5</p><p>- Changed AntPlus.BikePowerListener callbacks into AntPlus.BikePower calls as this seems more reliable especially after booting/resuming device. Should start displaying data more reliably than before.</p><p>v0.4</p><p>- Attempted fixing error when initially selecting this data field.</p><p>v0.3 </p><p>- Attempted fixing issue with data not being displayed after resuming etc. Might not be completely resolved yet.</p>

Additional Information

  • D2™ Charlie D2™ Charlie
  • D2™ Delta D2™ Delta
  • D2™ Delta PX D2™ Delta PX
  • D2™ Delta S D2™ Delta S
  • Descent™ Mk1 Descent™ Mk1
  • Edge® 1000 Edge® 1000
  • Edge® 520 Edge® 520
  • Edge® 520 Plus Edge® 520 Plus
  • Edge® 820 Edge® 820
  • Edge® Explore 1000 Edge® Explore 1000
  • Edge® Explore 820 Edge® Explore 820
  • Forerunner® 645 Forerunner® 645
  • Forerunner® 645 Music Forerunner® 645 Music
  • Forerunner® 935 Forerunner® 935
  • fēnix® 5 fēnix® 5, quatix® 5
  • fēnix® 5 Plus fēnix® 5 Plus
  • fēnix® 5S fēnix® 5S
  • fēnix® 5S Plus fēnix® 5S Plus
  • fēnix® 5X fēnix® 5X, tactix® Charlie
  • fēnix® 5X Plus fēnix® 5X Plus
  • fēnix® Chronos fēnix® Chronos
Average Rating: (8 Ratings)

Sergio Ordás Pol
May 4, 2022 | Version 0.5-up-u-upd8

Works well with favero pedals. It would be nice if the values ​​of each pedal could be seen in a larger size, I can't read the values ​​without glasses up close

Sébastien Spieser
October 19, 2019 | Version 0.5-up-u-upd8

Hello, Just tried with PowerTap P1 + FR935; power was displayed on the Garmin Power Datafield, but nothing on the backward power field...

Leonello De Valerio
January 23, 2019 | Version 0.5-up-u-upd8

with the power2max crank it does not work well. Returns exaggerated powers.

Developer Reply
October 4, 2019, takura87

The formula used in this data field is extremely simple and I don’t see a possibility for “exaggerated” values. What did you see and what is your reason to think the result was not simply your pedaling technique? Contact me. (That said, spider-based power meters don’t support true left-right balance, so your p2m doesn’t really meet the conditions stated in the app description for this to work as intended.)

Joe Morgan
September 2, 2017 | Version 0.5-up-u-upd

excellent idea for immediate feedback on pedal stroke. really helps smooth pedal technique. some of the numbers are maybe a bit small.

July 22, 2017 | Version 0.5-up-u

fantastic some important data to stay efficent on pedalling. fixed on every page on top.

Stefan Reiter
July 13, 2017 | Version 0.5-up-u

Very cool idea and interesting to see how much power is lost due to inefficient pedaling! Would be cool to add some sort of colour-coding such as 0-30W = Green, 30-50 = Yellow, 50-70=Pink ... Anyhow a very cool datafield!

Thomas Skov
March 29, 2017 | Version 0.5-up

great idea and very interesting to use. Would it be possible to add the option to use a 3s average instead of the current? I don't know if it would make any sense but would be a nice choice to have.

Developer Reply
April 7, 2017, takura87

Thanks for trying this out and taking the time to review. Agree that some averaging could be useful as the numbers jump around a bit. Thanks for the suggestion, will consider in an update.