Pixel Watch 3 gets inaccurate stride length

[Sindrety]

Hello. I have the pixel watch 3 45mm lte and when I run on the treadmill I get very inaccurate stride lengths. I usually run 10km, but the watch only shows 7-8km. I have calculated my stride length and put it in manually, but whatever I put, the distance shows 7-8km everytime. Feels like it's not using the manual length put in at all.

Today I tried using run instead of treadmill and turned off the gps, but still got the same result. When I use the run feature it actually shows the stride length I use and it's 94,5cm, but it should be 116cm.

I also tried setting stride length to 2 meters just to try to trigger it, but it does not change.

Is it something special I have to do too start using the manual stride length that I set?

(Also, I have tried this on different treadmills and I get similar results on all of them)

I used the pixel watch 1 for two years and had the same problem so it's not the device either.

Thanks

Moderator Edit: Clarified subject

[JohnnyRow]

Did you notice in Stride Length setting, there are 2 stride lengths, walking stride length and running stride length.  To be sure, try setting both, but I think the "Treadmill" activity always uses the Walking Stride Length.

[Sindrety]

Hi. Yeah I put the same value in walking and running. Forgot to mention it😊

[YachatsMike]

I walk on a treadmill.  (my 77 year old knees can't run)  I don't trust the Fitbit to calculate distance or calories.  It doesn't know what grade I  have the treadmill at.  (I use a fixed speed or 3.8 mph, I vary the grade in intervals and my average grade is 9.2%)  It's also just guessing about distance based on steps.  I use the American College of Sports Medicine (ACSM)  formula for treadmill walking to calculate Mets and Calories.  I trust the distance from the Treadmill Controller because it's based on the actual belt movement.  What Fitbit gives me is Heart Rate and Active Zone Minutes.

[hariskar]

Treadmill distance can't be edited/calibrated after run. This definitely should be fixed.