Hi! Picked up an old Gitane "ic interclub" with one Panaracer Record Tire on the back Mavic rim,and nothing in the front. Everything seems to work fine, except for missing a tire and rim! I just planned to buy a new rim and 26 inch tire. As I investigate, this is getting very complicated. Could I just put any old rim and tire on this bike? Must I replace the back one too, if it is tubular (which I think, from my reading, that it is). Tubulars sound not so sensible for regular road cruising for my 18 year old son. Thank you SO much for any suggestions.