Buying Schwinn 564 qwerty?
The bike has Biopace chainrings which are not supposed to be round, nothing to worry aboutThe price is still a bit high, the components on the bike were a couple of notches below 105 at that time, but reliable and serviceableIf the chain has a stiff link, check it and the cassette very carefully, if you have to replace them it could cost you an extra $60-$70 in partsI had a bike with similar components back about then and it stood up through many years of heavy use.
You may be able to find a compression fitting that will connect dissimilar metalsCheck you plumbing supply storeIf it is not rated for dissimilar metals DON'T do itCompression fittings are a lot easier to use for the inexperienced, than flair fittings and less tooling required.
