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Summary: By looking at a bicycle's brakes, frame, seat and tires, learn how to date an old bicycle in this free video from an experienced vintage bicycle dealer.
"So I've shown you the different styles of bicycles. I've shown you balloon tire bikes, say built from the mid thirties to the mid fifties. I've shown you how to identify them. The middleweight cycles, built from the mid fifties to the mid sixties, and the stingray style bicycles. I've showed you the how different brakes operate. There are cable brakes, coaster brakes, and rod brakes. Those are the most common that you're going to find at a yard sale, flea market, whatever. I've showed you some of the accessories you can find on a bike, whether it's lighting, or glass parts versus plastic parts, different seat styles, different rim styles, different tire styles. You can look up a serial number on a hub. You can look up serial number charts on the web, depending on the manufacturer of your bicycle. These are all different tools that you can use to determine if you've got a bike that's a vintage bike, thirty years older, older, older, or a classic bike, or a collectible bike, or just a cool old bike."
eHow Article: Determining Bicycle Age Tips