That's a tough call. You might be better suited to a Small, but that will totally depend on your inseam, torso, arm length, and flexibility. I'd recommend going to the Scott website, selecting an Addict RC and then clicking the "Find you size" button. That will walk you through taking some of those measurements and it will suggest the best size for you. Good luck!
I have the same bike. I’m (174cm) and I’m riding a 52cm which is a small and it’s just perfect. A medium which is the 54cm might be to big where you would have to shorten the handlebar stem and also drop the seat post.
