I've never had a problem with corrsion of steel bikes when it comes to just rain and mud. I've got a drain plug in the BB shell for draining water. It does get wet and muddy in the winter where I ride, but snow is less common, so it's never cold enough for salt on roads etc. I'm not sure if this is what you were referring to??? The Rohloff has made handling the elements and winter muck much simpler.living in New england and riding year round does make me worry a little about corrosion and rust on a ferrous frameset! How's your thylacine handling the elementts???