RawBert said:As for Schwinn, heavyweights are considered "Balloon" Tired Bikes S-2 wheels (26x2.125) these bikes are heavyier and were produced up until the late 1950's. Middleweights look about the same such as frame and fork, but the dropouts are a little more narrow. These bike had S-7 wheels which are a tall narrow 26" wheel. also quite abit lighter. Middleweights were produced in the 60's and 70's. Lightweights are the roadbikes and dimond frame bikes with skinny wheels/tires. hope that helps...
karfer67 said:what wheels are you using? if they are the original s-7 wheels the felt tires wont fit. if you get regular aftermarket chrome cruiser wheels they should clear but you might have to remove the fenders. the early schwinn middleweights you can sometimes get lucky with stuffing 2.125 tires in those
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