Yes, flat mount – first time of dealing with it, so its’ a whole new lot of frustration to go through.
Thing is, the frame I ordered gets sold as a full bike with 160mm rotors, so assumed (stupid, I know) that it might have been designed with that in mind. The adaptor I can cope with, but six different bolt sizes – really?
The MTB bikes & frames I have bought that are sold with 180mm discs have come with post mount drillings, so that calipers can go straight on, so you don’t always need an adaptor.