I’ve noticed a difference in the TSS calculations on uploaded rides in TR compared to TP, but it’s never been that much or affected anything. However, I set my Garmin head unit to show TSS at the weekend as I was doing an outdoor ride but time was against me so I topped up my weekly TSS up with a shorter harder ride. At the end the Garmin read a TSS of 175. I realised this was probably suspect as the TSS was going up as I freewheeled the last 2km downhill to home. This is compared to a TSS of 93 on TR and 107 on TP.
Is there a fairly solid relationship between Garmin TSS and TR TSS. So if I went out to top up TSS again I’d know that the TR TSS will equal about 1/2, 2/3 etc of what Garmin thinks?