I now have 2500+ miles on my Madone. The chain has developed a click, every two revolutions of the pedal. I think it is binding somewhere. It's clean and well lubed. When this was happening, I stopped and pedaled backwards watching the chain, and the master comes around every two cranks in the gear I'm in, so I really think it is chain.

Haven't measured the length yet, but could this be a sign of needing replacement? Is 2500 miles out of the stock chain good? I crank a LOT of hills in my rides, not much flat area, and with my weight, I'm sure I have put some good strain on it.

My real question is, do I stick with stock? Or is there something better to replace with. Even if this turns out not to be the problem, I plan to get a chain as a spare.

Thoughts?