I havent seen this mentioned yet so I wanted to provide this info:
According to Alisa, both the front and rear flat mounts are designed to work with 160mm brake rotors.
I had thought that perhaps being lightweight the frame would be set up for 140mm, and I would need to buy adapters (the Force E1 groupset bundle comes with 160mm rotors).
If others have built up the bike to the point of mounting calipers and can confirm, that would be great, too.