Sorry but i think the Bike is tooo small for you with 179cm and Size Medium!
I'm not locked in yet so I can change it. Can you tell me why you think this would be to small?
If I go off what bike manufacture suggest they put me at a large based on my height. My concern with getting a larger size is I don't want to feel stretched out or hunched over the front of the bike while in the seat position. I prefer to me more in a neutral position. While my current bike is a one size fits most it would fall on the large size. Event though I've slackened the front by 2 degrees, shorter stem, and installed bars with more back sweep I still feel hunched over and baring to much weight on my hands. I know guys my height prefer the medium over the large. I also know guys that are way taller than me that fall into the XL but prefer the large.
Like everyone we want to make sure we get the right size so we don't get stuck with something that doesn't fit and not enjoyably to ride. I've been researching sizing the best I can so if I'm missing something please let me know. I really want to make sure I get the correct size that fits me best.