Not sure if I'd call it a crack. looks like a snap!....Riding up a steep climb I felt a pop. I thought it was the BB spindle or a chairing bolt. As I looked down my legs were pedaling out of line so I figured a chinring bolt snapped. It was geting dark so I soft pedaled home. Upon further investigation, I have come to the conclusion that my frame is toast!
Good thing it was on the way up. Just a heads up. if you feel something pop, check it out immediately, take no chances!