As soon as I stood up and started to pedal, it popped and shot out off the back of the bike. Is this a common problem? This happened to me last summer and I can't figure out what is going on. The chain I broke last year was a shimano, so I chocked it up to improper installation, but yesterday I was riding on a sram with less than 300 miles on it. Not to mention the fact that the link that blew out had never been removed, it was as the factory assembled it.
I admit that this is a winter bike I am running as a single speed, so the chain wasn't meticulously maintained but after 300 miles?
Am I just too strong for the modern 8 speed chain, or am I missing something?
Edit: don't know if it makes any difference, but I weigh in at 230lbs, and my steel frame commuter adds ~25lbs so I am pushing a lot of weight around town.