Originally Posted by
veganbikes
Chains really don't quite stretch so much as material wears out from the bushings and pins It is more a chain deformation or maybe elongation as the actual links don't change in size.
Yes bushngs and pins wear out....but the term " chain stretch " is a very common term used to describe chain wear. Even bike shops and bike mechanics use that term. Many a time I have compared a worn out chain to a brand new one and there was a very noticeable difference in the overall length. IMHO magic gear ratios isn't a proper way to go about it when dong a SS conversion.