Anyone have any ideas on how to do this? I change it in my profile but on my ride analysis is continues to show 200watts and calculate TSS etc from here. I really want to be able to use TSS...

Probably need to change on your watch and in your connect profile. If you just use TP instead it will calculate based on your zones in TP.

AFAIK, you have to change it in the device you are using to record the workout, not in the profile on GC.

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Proudly Team BSR

hmmm

I will try this.

So, I have found that if I download my ride file directly from PowerAgent into Training Peaks, it uses the calculated TSS from my Joule. However, if I first save the file on my computer and then upload the file from Training Peaks, it downloads the correct TSS.. Not sure if this is 100% right but I think it is

Just change it in the settings in Garmin Connect (website). In the "modern" GC, on the lefthand side click on the little silhouette, then Settings, Training Zones, click on the Cycling tab and scroll down for Power Zones. Not sure if it does this retroactively for older workouts.

Nope, and you wouldn't want it to. To impact older workouts you'll need to delete them from GC, change your FTP and then re upload them. You'll have to do the same on TP or any other site you use.

If I'm reading this correctly you are not correct. At leasr with respect to TP. You can adjust your FTP and have it retroactively adjust TSS to whatever date you specify. It is called TSS backfiller.

Just ran into this myself. I have a 510 - Garmin Connect doesn't talk to the device in this way. Even if I "send workouts", it doesn't send training zones or anything with it. So inside Garmin Connect you establish your training zones, which is useful for workouts, etc. But then on your device you have to go to settings (510 and I believe 810 would be similar, I don't know anything about other models) and scroll down to training zones>power and manually input your FTP as well as your zone 1, zone 2, etc. The default FTP is 200, which is what I think you're experiencing.

I think you have to change it on the device

Thanks.
I have done this. My first ride with new setting is in 1hour. I will reply as to how it works out.

Worked.