I was out on a ride today and changed gear on a hill. Unfortunately, I was on the 50 ring at the front and went too high on the rear cassette. Result was that the rear mech jockey wheel contacted with the cassette tooth and ripped the rear mech back behind the cassette. End result is shown in the picture. If the frame manufacturer had used a replaceable hanger I would have had a £20 bill, now I need to find £1800 to replace the frame.
Spoke to the shop and they told me it's my own fault for having the chain too short and that you should be able to use any gear combination on the bike.
Really annoyed about this.