So I just purchased a new bike, a Trek madone 5.2 with ulegra. Unfortunately, the 2014 and up models come with ultegra 6800 11 speed. So being a junior you either have to get cyclocross chain rings or a custom cassette. I choose the cassette, Miche 14-27 to be specific. It worked for sometime, however after 1,000 miles it no longer seems to like me. After trying to adjust the rear shifting the barrel adjuster no longer want to screw in. I guess to go along with that the shifting is now absolutely trash. I've released the tension and checked the limit screws and they seem to be fine. Any other suggestions? Anything would be appreciated, you really never know what might work.