So Trainer Road places me in the Tallac Sweet Spot intervals with a goal 230. Today it was tough to get 225. 230 in Training Peaks is my high tempo (not sweet spot). According to TP, I don’t get to zone 4 sweetspot until reaching 231 thru 269. So I felt like I was in sweetspot for these “that sensation you get before your legs start to lactate uild” I do notice that Trainer Road’s calculations are different then how Training peaks calculates their zone 4 sweet spot ranges. Also huge differences are noticed on the road with same bike and same power meter. Much easier to pull 240 vs on the trainer. Their are so many variables.