I have a Truvativ rouleur GXP crankset. Whenever I am in the small chain ring and the bigger rear cogs (like the biggest 4), the chain will fall off after a couple rotations of the crank. At first I thought it was the limit screws or maybe the way the front derailleur is positioned, but then I looked over it and they seem fine.
I think that the chainrings may be bent slightly. Are there any other possible causes?