Derailleur

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

A derailleur ( di-RAYL-ər; di-RAYL-yər) is specifically a device that moves a bicycle chain from one sprocket to another, and more generally the entire gearset on a multiple-speed bicycle with such a mechanism.

Excerpt from the Wikipedia article “Derailleur”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ralf Roletschek, GFDL 1.2, via Wikimedia Commons.