Hi folks

I just started riding road bike about a month ago and am currently using a Fuji CF bike that my wife had bought a few years ago and did not use much. It is a nice light bike (49cm) and has good components but I am not sure it is sized for me. I am 5'7" and about 160lb. I've done local bike rides that range from 15mi to the longest one being 45mi and I can say that up to 30mi of riding is doable for me as of today. Over 30mi though I am having trouble - not necessarily with my ability to ride the bike, but comfort. Although part of it may be the practice and also the fact that I need to improve fitness, I am quite sure that the bike is not "fitted / sized" to me properly.

So the question is where / how can I get the bike sized / fitted to me? A local shop recommendation would be nice (I am in Cupertino / Sunnyvale area). If there are other suggestions, I would love to hear about them as well.

Thanks in advance.

-- Vivek