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I use a Garmin 1030 to record my rides and they automatically upload to Strava (IOS app).
No power meter used so Watts are calculated by Strava algorithm.

since recent SW upgrades (both Garmin and Strava, don’t know which is causing problem) power figures are hugely over-reading. Example freewheeling down a long 8% hill power is shown as 158w if I then use ‘adjust elevation’ feature in app the power drops to 6w and total elevation for ride only changes by 8ft on total of around 880ft.

Strava iOS app SW rev is ? How do you read this?

phone Sw rev 18.1.1

Garmin connect rev 5.8.1.3

Problem is consistent now for all rides, power always corrects itself when. ‘Adjust elevation’ is used.

Any ideas what’s wrong? - Alan 

If the elevation data coming from the Edge 1030 are wrong (like flatter on descents and steeper on ascents than in reality) this can lead to higher power estimations by Strava. The correct elevation in Strava solves this as you have observed it. This is a problem on the Edge site, Strava didn’t change their estimation formulas.

I don’t think the elevation data from the Garmin is wrong as I have looked at the FIT file and the data seems good with no spikes. I think the ‘Adjust elevation data’ feature corrects the power to more sensible numbers simple because, in recalculating the elevation, the power numbers are recalculated. The elevation total is virtually unchanged after update.

​@Thomalan You could try then to use other methods that force the recalculation of the estimated power, like changing the gear or the activity type back and forth. In case the estimated power at the end of this procedure changes similarly then it wasn’t an elevation problem.

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