Zwift Runn with GC

[Patrick Gharios]

Hello,

I would like to use my Zwift Runn https://us.zwift.com/products/runn with GC in train mode.

Goal is to create run workouts,  run on treadmill and feed GC in train mode via Ant+. 

Trying to find the proper documentation to do so.

Is the Zwift Runn detected as a power meter in GC?

Thanks

[Ale Martinez]

It has not been tested, AFAIK. The link you posted says it measures speed, cadence and incline, not mention to power. 

[Patrick Gharios]

I managed to pair and it is detected as an ant+ runpod. Which telemetry should reflect run speed and run cadence? 

Best regards
Patrick

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[Ale Martinez]

El martes, 2 de septiembre de 2025 a la(s) 2:50:30 p.m. UTC-3, Olex Traisky escribió:

I managed to pair and it is detected as an ant+ runpod. Which telemetry should reflect run speed and run cadence? 

I expect to be Speed and Cadence, there is no field (or feature) specific for running on Train, IIRC. 

[Ale Martinez]

PS: I looked at the code and it seems current footpod support would not be too useful for this sensor, or for any modern stride sensor measuring stride length:  https://github.com/GoldenCheetah/GoldenCheetah/blob/4b6dd0cabd14a81337c6d8092fbb426c94e4aa72/src/ANT/ANTChannel.cpp#L1186-L1231

[Peret]

I did some modifications in my GC fork to get what you are proposing. Moreover, my treadmill does not use ANT+ but only BT, so I needed some piece acting as a bridge to the ant+ device used by GC.

In the end, I found QZ Domyos, that acts as a bridge between the treadmill and training software. QZ Domyos can send through ANT+ data received from BT treadmill. It sends speed.

I had to modify some lines of the code addressed by Ale, because neither cadence nor speed message received from QZ was correctly understood. Maybe it can help you. Previously, I deactivated simulated speed in case of a footpod device.

These are the commits with the changes:

Footpod ANT+ device corrected to read correct speed

If any of the active devices is a footpod, simulated speed will not be used, as it is a treadmill

In such branch, I also added other feature: ability to control the slope in the treadmill by GC, but with very specific code and QZ dependency, perhaps not suitable for you.

[Ale Martinez]

El viernes, 5 de septiembre de 2025 a la(s) 11:52:10 a.m. UTC-3, Peret escribió:

I did some modifications in my GC fork to get what you are proposing. Moreover, my treadmill does not use ANT+ but only BT, so I needed some piece acting as a bridge to the ant+ device used by GC.

In the end, I found QZ Domyos, that acts as a bridge between the treadmill and training software. QZ Domyos can send through ANT+ data received from BT treadmill. It sends speed.

I had to modify some lines of the code addressed by Ale, because neither cadence nor speed message received from QZ was correctly understood. Maybe it can help you. Previously, I deactivated simulated speed in case of a footpod device.

These are the commits with the changes:

Footpod ANT+ device corrected to read correct speed

I think we could merge the speed change provided it is applied when configured Stride Length is zero, otherwise use the previous calculation.

 

If any of the active devices is a footpod, simulated speed will not be used, as it is a treadmill

This exception seems generally useful, if you want these to be merged so other users can test please create a PR. 

[Peret]

Sure, I am arranging two independent PRs, as I understand from you that is a better option.

Regarding speed calculation, I was not sure it was the general device behaviour, and even I do not understand very well the implications in the change, ignoring cadence, stride length,... It worked for me, but as a ad hoc change; that's why I did never requested this change. But, following your comment, I have tried to fit the changes, and speed is read from ant+ in case stride length is configured for the device, and cadence is present.

I hope it is ok, but, sorry, I cannot test with any real footpod.

[Ale Martinez]

El domingo, 7 de septiembre de 2025 a la(s) 1:06:28 p.m. UTC-3, Peret escribió:

Sure, I am arranging two independent PRs, as I understand from you that is a better option.

Regarding speed calculation, I was not sure it was the general device behaviour, and even I do not understand very well the implications in the change, ignoring cadence, stride length,... It worked for me, but as a ad hoc change; that's why I did never requested this change. But, following your comment, I have tried to fit the changes, and speed is read from ant+ in case stride length is configured for the device, and cadence is present.

I hope it is ok, but, sorry, I cannot test with any real footpod.

Thank you, both are merged, if the OP of other treadmill user wants to test there are installers available from https://ci.appveyor.com/project/Joern-R/goldencheetah-knhd8, select the OS and go to Artifacts, there is a daily quota for downloads so you may have to retry later. Setting stride length = 0 in footpod configuration enables ANT+ speed. 

[Ale Martinez]

PS: once you have speed from the treadmill it would be possible to enable virtual power using a custom curve, to derive that curve you can do a step test for a range of speeds, use Edit > Fix Running Power and look for speed/power for each step. If there are interest we could look for a way to integrate power estimates directly accounting for gradient.