A recent text from a friend read “Help! I think I ruined my frame, Jim!” I called him straight away. He said he was just riding along, had gotten to a steep little pitch, and shifted into his easiest gear when he heard an awful crunch that locked his pedaling and forced him to step off his bike. Looking at his drivetrain for what could be the problem, he said he was horrified to see that his rear derailleur was now inside his rear wheel and only connected by the cable and housing and chain. It had been torn clean off his frame! Hence the text about his frame being ruined.