Where can I go online for information on buying a used bike? I found an old thing in a consignment shop probably from the 70s that weighs a ton. Forgot the name on it... something French. At first glance it appeared to be in good shape; gears shifted smoothly, brakes worked well, wheels were true... but it's so heavy, and so old... maybe these are good qualities... how much does the weight of the bike affect its performance for a casual rider?
Sorry for being non-sequiter.