Originally Posted by
HillRider
+1 on the chain watcher. I've used both the Third Eye Chain Watcher and the N-Gear Jump Stop and both have worked well. There are also others such as the Deda Dog Fang but I don't have any experience with it.
You set them up so they run as close to the granny chainring as possible with just enough gap for the chain's inner plates to clear. You can then adjust the shifter and front derailleur inner limit screw to give a solid shift but the chain won't (can't) fall off the inside.
Excellent advice, I pre-emptively put Jump Stops on my bikes. As much as I obsess about keeping my drivetrains adjusted, things do happen, and I hate digging a greasy chain out and re-railing it.