Originally Posted by kbjack

When I said the big-big combo threw the chain off the ring, I meant that the chain was being forced (inboard) off the large front chainring. The RD limits are properly set.

My other suspicion is that the bb spindle is too long--but, man, I really don't feel like messing around trying to find a shorter spindle for these cottered cranks. I honestly don't have much experience with cottered cranks and would rather just leave well enough alone.

I'll try and take some pictures this evening.