Originally Posted by bostontrevor
Actually, 9 times out of 10 (ok, that's not really a scientific poll, but let's just put it at most times) I hear of, it's a Shimano 9-speed chain coming apart at a link pin.
Installation Error. I would bet that 8+ of these failures are due to improper installation, reusing pins, or not using the special shimano pin.
Shimano is one of the harder chains to install, cheapo KMC or SRAM chains are much easier, and some have the powerlink dealie....