120 years after the first safety bike was introduced, and we're still using something as crude as a derailleur! Sheesh, the name says it all:
derail(intransitive) To come off the tracks.
The train was destroyed when it was derailed by the penny.
(intransitive) To deviate from the previous course or direction.
The conversation derailed once James brought up politics.
(transitive) To cause to deviate from a set course or direction.
The protesting students derailed the professor's lecture.
Thank God for companies like Rohloff. Maybe they or somebody else will finally develope a proper CVT or lighter gearbox to replace this primitive relic.