Schwinn's were built to LAST... at least the frames and the one piece cranks, among other things. The steel, seamed rims (of the 60s/70s) were dogs and had a tendency to develop flat spots, and the derailleurs (while built to take abuse) were pigs as well. But I'm sure our grandchildren will see these same Schwinn framed creations still rolling on better rims and updated components 50 years from now.