If you are using 2 power meters (or Garmin and Stryd for runners) or training indoors with software that supports trainer power and power meter power, it is now easy to compare those on Intervals.icu. Do Actions → Settings and click “Power Field” to choose the primary one used for activity analysis etc.:
You can also create your own custom charts and add “Power2” as a plot (e.g. to add smoothing etc.).
Note that you need to reprocess any existing activity files to see the new stream (Actions → Re-process File under the timeline chart). You can do this in bulk from the activity list view (Edit → Reprocess File).
I am going to be adding more ways to compare Power and Power2 on the activity power page soon.
For people working with streams in Javascript, the “Power2” stream is called “secondary_power”.
No you don’t need a custom stream if the power field name is known to Intervals.icu. I will look see what BikeTerra calls theirs. Otherwise you do need a custom stream with units “watts”.
All of these case-sensitive names work. It is easy for me to add more as people find them:
case "power":
case "Power":
case "Power2":
case "power2":
case "secondary_power":
case "curVpower":
case "RunPowerE":
case "C Power":
case "RP_Power": return "watts";
Thanks, but that app appears to be for Garmins that don’t record power at all. I was asking about how to record 2 power meters simultaneously on my Garmin (Edge1040) in order to use this feature.
Edit: I’ve just realised what you meant. Thanks
Just tried this with a TP Virtual fit file with dual data but it did not work. Not sure what they call the secondary power in TPV (Powermeter Power ?).
Just so I understand, if I record power from my smart trainer on Zwift which uploads my ride to Strava and which then uploads to intervals.icu that’s one stream? Then if I simultaneously record my crank arm based power meter on my bike computer and upload that file to Strava which uploads to intervals.icu that’s the second stream?
However, doesn’t that look like two training events in intervals.icu or do they get merged somehow?
What you have described is two training activities. What you need for this is a single activity recorded by a single device/application and is connected to two power meters.
Garmin can do this with the connect IQ field above for the second meter.
IndieVelo (TPVirtual) does this. (as part of its cheat detection)
I’m not sure if any other devices or applications do it easily.
And if you upload through Strava, it would likely remove the second stream regardless.
Maybe I missed it above. I rarely look at CIQ store. Did a quick search and nothing. Im sure it’s impatience on my part. Do you have a name of a CIQ app or data field to allow 540/840/1040 to record a second power meter?
Yeah, ideally we could import another power source on the same activity on intervals.icu (Strava would mark that as a duplicate and suppress it).
Back then, when I had a powermeter on the bike that was on my HT, I needed to compare them to adjust my workouts (or to change parameters on the powermeter: the XCadey I also have allows that). It was quite difficult to compare sources (I don’t remember how I was able to do it. Maybe with GoldenCheetah, or another app… or maybe using a spreadsheet. But in the end, I finally removed the powermeter from the bike that his now permanently on my HT to keep it on my outdoors bike. When I train on the HT, it’s always harder than outdoors, so whatever the difference between the powermeters, I do my first Winter rides by feeling. After some time of adaptation, I adjust the required power on the workouts. I don’t really care anymore about the FTP numbers during the Winter, what matters is to know if I will be able to improve my PR outdoors during the rest of the year.
