Originally Posted by WhyFi

Are you on Intervals.icu? Like you, I don't have a PM on all of my bikes, but I do on the primary (and the trainer, of course). One of the things that I really appreciate about Intervals is that, once they have a correlation between your HR and power data, they seem to do a much better job of estimating (and therefor tracking) training load on rides with an HRM but without a PM. An account is free, but I'm appreciative enough of it that I subscribe/donate.