Originally Posted by
Papa Tom
Good point, The KMC link was something I bought and never really paid much attention to, as I figured it was not likely to be used in an emergency, but rather during a leisurely servicing of my chain. For this reason, i never even bothered to confirm whether it can be re-used, and to this day, my assumption is that it's a single-use item. For this reason, I have never done a trial run with it.
When I discovered quick links, I bought them for my Shimano chains and put them on right away. That meant breaking perfectly good chains, but the convenience of a link was too much to ignore. Then I packed a spare link in my backpack. Now I just always buy KMC chains to begin with, so a link is a given. As far as single use goes, my thinking on that is for the life of the chain, and I'll otherwise disconnect and reconnect as often as I like.