Ah la la - sorry. I meant which tire of course. My problem is that I have a rim that is there for good, and then I would like to see which tires are possible f

Ah la la - sorry. I meant which tire of course. My problem is that I have a rim that is there for good, and then I would like to see which tires are possible for that given rim (there are several choices of width and I do not understand what drives the minimal and maximal width - I can imagine the the brakes are a limiting factor for the maximum width, but maybe this maximum is smaller because [some measurement of something]). Then comes the tube, thus the OP's useful page.