Originally Posted by Psychocycles

I can ride any distance between 0 and 95 miles completely pain free, but right around the 95-100 mile mark, the top middle of my left knee consistently flares up to a sharp pain in a point. Not sure why or how, could it be that a certain muscle group supports my knee just fine for the first 95 miles then fatigues and causes the pain?

What causes knee pain deep into a bike ride? I'd imagine if there's fit issues it would show up earlier than 5 hours into a ride?