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Damn, shame you had to quit the ride so early. At least you got some k's in your legs!
For me it was a very pleasant ride, sunshine and a steady 6m/s wind and not too hot (13 degrees at the start, about 20 at the end). Did two longer bouts near LT1, first at 282W and second at 275W. It seems that the LT1 endurance falls a bit after 2h, I could still pass the talk test but the muscular effort was slightly greater by the end.