Peak power lower on Strava vs Wahoo Bolt

Does anyone else find that Strava “trims” peak power from what is displayed on the bike GPS? I’m using a wahoo bolt and a 4iiii power meter and find peak power always lower on Strava. Here is an example from today:


Obviously this is really important as I’m unable to flex to my friends how powerful I am. So any help would be appreciated :joy:

Yeah mine does that as well. Just upload that screenshot to your ride so you can flex on them with a picture :grinning:

I assume Strava is 3 second power rather than 1 second?

True power doesn’t drop that quickly, so 3 vs. 1 second smoothing should only make a difference if there is an artifactual power spike.

To determine the root cause, best thing to do is download the data and inspect it. That would show whether the screen or Strava are faithfully reporting what was recorded, even if the latter is wrong.

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No issues with my Garmin, max power matches between bike computer, Strava, Garmin Connect, TrainerRoad, etc.

I’d report it to Wahoo.

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Lol, it’s a wahoo!

Strava recording/analysis is hopeless I find. I would say the Old’s comment is possibly on the right track. My Lezyne and 4iiii combo has recorded a couple of 1800W “max power’s” when in reality I’m topped out around 1200W.

I’m not sure Strava is clever enough to be doing it on purpose though :man_shrugging:.

Strava munges the data a little, and thats why I mostly ignore it. For example a zone 2 ride from earlier this week:

Data Garmin TrainingPeaks TrainerRoad Strava
Avg Power 170 170 169 174
Normalized Power 185 185 184 180
Max Power 1008 1008 1008 1008

Strava is off on everything except Max Power.

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Strava doesn’t use Normalized Power. It’s a ripped off of xPower, Dr. Skiba and PhysFarm Training Systems. Ripped off because there’s no credit given. Xpower is 25 second rolling average as opposed to 30 second rolling average for Normalized Power. The rest of the algorithm are the same.

Gaps in recording, ride status, are automatically corrected when uploaded to Garmin (from Garmin headunit), Training Peaks (WKO), and Trainer Road. Raw files are not corrected when uploaded directly to Garmin and Training Peaks. Workout files from Trainer Road are corrected not raw. WKO maintains the raw dataset but ride status are based on corrected.

Gaps in recording IS NOT Garmin Smart Recording. It’s Rx or receive fail where it just didn’t pickup and usual one second in duration.