Re: First Build GT2-A frame [PICS INSIDE]
The headset is indeed 1 1/8". I would not use the one that came with the frame as the bearings don't seem to be good quality. I'm going with a CANE CREEK 40 Headset. I ordered some more parts this week and will be posting part numbers and pictures.
The bottom bracket is the traditional american one piece. If you buy the SBP kit there is an option to add the adapter. I just bought it separately since I don't know the quality of the one they sell. The one I bought is a truvativ adapter and it was on sale so I grabbed it anyway.