I couldn't find this in previous posts, so I ask your permission to post it here...
Is there a way (or multiple ways) to estimate (guesstimate) the TSS based on the TRIMP score? When doing MTB rides, I do not have a powermeter. What I do today is take a more or less similar (duration and RPE) road ride with a PM and use that TSS for the MTB ride.
I have also made a long list of TSS-TRIMP ratios for my own road rides, so I could use this ratio to estimate the TSS for a MTB ride. Nevertheless, is there any other efficient and true way of doing this??