So what I’m wondering is do my legs just not have the fitness to go more than an hour steady non stop at 170 watts? They seem to manage on the Tuesday night group rides where I’ll sometimes still feel very strong at the end of the ride; but those rides are very punchy with periods of rest. Yerstersay I really made a point to spend a solid hour in zone 2 HR and only dropped below very briefly when going down hills ending at a T or waiting to enter a busy road.

I suppose there are some differences between Tuesday sufferfest and Friday sufferfest. Tuesday there’s lots of coasting and surging. Friday I try to pedal the entire time even after hard, punchy efforts. I used to try to go as fast as I could tucking and coasting down hills on solo rides but since my brother didn’t wrap the top part of the new aerodynamic bars I got per a bike fit; now I keep pedaling down hills, even if I’m peddling at 40mph (I can’t safely supertuck anymore without the bar tape).

maybe my legs just aren’t used to the constant effort beyond an hour and a half. I’m a bit disappointed and surprised that I haven’t improved much on the endurance rides despite doing them every week.