surly old man
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
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A couple of things out there that do something like this:
-the derailleurs themselves are their own "correctors" I suppose.
-Bashguards on the front ring keep the chain from going too far over or under.
-Paul and, I think, Rohlhoff make something like a dummy front derailleur cage that keeps the chain from slipping of the rings
-N-stop and some others make a little clamp on projection that keeps the chain from dumping off the inside of the front chain.
-and a whole bunch of various things that downhill MTBers use to keep the chain from bobbing around.
-good ol' dork disks keep the chain from overshifting into the spokes on the rear.
-on singlespeed setups I have seen a specialty cog that has a small flange on both sides of the cog that keeps the chain from wanting to go somewhere else.
Not to say that there is not room for another solution, but as it stands there are several ways to keep the chain from being where you don't want it to be.
Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...