I ride a new Gary Fisher Piranha for exercise and fun. I'd say I've put about 700 miles on the bike so far. I couldn't be any happier with the durability of the bike, especially at my uber-clyde weight and considering the rough terrain that I ride. The only problem is, I've broken two Sram 971 chains in only 700 miles. They're not breaking at the master link either. Both times, the sides of one link have simply bent out sideways, breaking the chain. I keep the chain regularly lubricated, and my drive train has only 700 miles on it and does not have any alignment issues.
Anyway, to my point. What chains don't break that often?? I hear that I'm supposed to get at least 2000 miles and up to 10000 miles per chain. I need a 9 speed chain that will last with my extreme weight and burly strength.