Originally Posted by hueyhoolihan

i am not familiar with the KMC Z72, but i do use the KMC Z7 (i think it's a 6-7-8 speed chain). it has bushings AFAIK, and i use a regular old school chain breaker to join, break, add, remove links. no problems in thousands of miles on the chain. use is SS only. so there is plenty of hurt put on the chain when climbing mt diablo (queen stage of Tour of California). i have busted one chain (different make/model) when, as mentioned, i reused one of the links, i'm pretty sure it was a bushingless, more modern, style chain.

BTW, i don't use the special link that comes with the chain.