The cream of dérailleurs – Disraeli Gears
Dérailleur:
NOUN – A bicycle gear which works by lifting the chain from one sprocket wheel to another of a different size.
Pronunciation: /dɪˈreɪl(j)ə
In the strict engineering sense this is a device which shouldn’t actually work. Derailling a bicycle chain by brute force from one sprocket to another isn’t really an elegant solution, but it does work, and, generally, in a smooth and efficient way.
So, for fans of the dérailleur, and maybe cyclists who never even thought about it, here is Disraeli Gears.