There are a lot of vintage bikes listed on CL. Most of the road type bikes are between $150-200 and I'm thinking about buying one but don't know what to look for. These bikes are heavier than today's road bikes aren't they? I mostly want to buy a good frame and slowly add different things to them like better brakes etc. What questions should I ask the sellers? Most of them are on the mainland and I'll probably only go across once to find the right bike. I don't want to spend too much time.