I did try erg mode with my own power meter on TR, but it was unusable. So I'd say if you do want to use erg mode yourself, use the trainer as the power meter.
@Sam started
The friendly cycling club based in South West London
@Sam
I did try erg mode with my own power meter on TR, but it was unusable. So I'd say if you do want to use erg mode yourself, use the trainer as the power meter.