I can usually deal with soreness and ride through the pain, but have had to get off the bike for a few minutes at times because of it. I like to do rides on unplanned routes from time to time and am more prone to this on those rides do to being unsure of whats next. To me, it feels like quitting sometimes, but theirs burning legs and theirs ON FIRE LEGS. Today wasn't too bad, 22 minutes of stopping on a 49.6 mile/3480 ft/16mph, but that was more stopping than I wanted. Do you feel disappointment when you dismount from the bike before you wanted do to fatigue?