girl's chains I toss out, unless thy're skip tooth. The girl's skip tooth chains I make into boys chains and they are fine. I bought a bike that had no less than 7 master links piecing together it's skip tooth chain. Why I don't know, but it worked fine. I salvaged the links . I have only broken two chains. One was on a steep hill on a 47 Schwinn. The other was on a Evans- Colson, and it was very rusty. Links can develop tiny stress cracks. Look them over closely before installing. If you don't have a chain tool, drive the pins out with an appropriate size drift punch. A small nail set works for this.