The rear derailleur on my girlfriend's bike snapped in half. She is over 60, only weighs 105 lbs., and rides green trails. That's bad enough as it should have failed like that. There was no crash or fall, no marks on the component. It just broke going over a very small root. To make matters worse, SRAM refused to honor the warranty, as they felt the mounting bracket should have broken first. Well SRAM, it didn't. Getting a response took weeks for the first one, and then nothing. Bad product, pathetic customer service.