Bought my first carbon fiber bike last month. Just found this damage by the rear derailer. How can I tell if this is just a chip in the paint or of the frame is damaged? The bike has not been in any crashes.
As mentioned, it looks like a chip, I wouldn't worry about it except to just keep an eye on it and make sure it doesn't worsen. I mainly wanted to add that not all carbon frames have aluminium drop outs, some have carbon and I'd say that is more and more common on newer frames. I have a 2013 Scott Foil and that has carbon drop outs, so it's not a new thing.