I have an update of sorts to the question I posted awhile back about chain issues with SRAM chains.
I was halfway through a ride yesterday, and snap, my chain broke while I was cranking hard, but not shifting. As stated in the other thread, the chain is breaking due to the side plates bending allowing the pin to pop free on one link. This got me wondering why this continues to happen on this bike, my Karate Monkey specifically. I have never had this happen on any other bike.
So, I measured my chain line from the middle ring of the triple to the middle of the seat tube. I knew it was a little too much, but it measured in at 55-56mm. I am pretty sure this is supposed to be somewhere between 47-50mm. Could this be the cause of my chains snapping? Is there just too much lateral pull on the chain, and eventually one of the outer plates fatigues enough that it just pulls over the pin?
I am thinking that must be the case, but I am not sure. I purposely have a longer bottom bracket on than is necessary to put the front derailer out further for tire clearance on the KM.