This must be a very basic question, but as it often happens with very basic questions, it is often hard to find the answer by searching.
On a modern bike with metal (welded) frame, is the interior of the top tube (and/or the down tube) accessible through the head tube? I.e does the head tube have holes in it that lead into the other attached tubes of the frame?
From what I could see on the Net, it appears that the head tube is typically a full cylindrical tube, without any holes. Is that so?
Meanwhile, it seems that I have some parts rattling inside the top tube of my bike (Specialized TriCross), which routes the rear brake cable through the top tube. I wonder how they got there, if the interior of the top tube is not accessible (aside from two fairly small cable holes/openings)