Hey guys. I apologize if this topic was already started somewhere on here. I'm a noobie to getting back into biking since being a kid. I like the ides of utilizing a bike to getting around the city and citibike isn't cutting it for me. I want to be able to get to work comfortably and fairly quickly. I have an entry level budget I think which is fair to put at 400 or less since I also want to test to see how committed I am to taking on riding for commuting purposes as well as leisure rides with my mother who's a triathlete. Also at 5'5 165 pounds what size bike should I be looking at? All recommendations are in advance greatly appreciated.