Hi all. This is my first post here; I hope I put it in the right place.

The Northrock SC7 bike at Costco seems interesting. I rode it and it fit me moderately, but I'd like to know the frame size for sure. My question is: can I find the frame size anywhere on the bike, or can it be measured? The store being Costco, they don't have bike-knowledgeable staff, but the bike is a good value for the high quality components.