Blogs What does a derailleur do on a bike? How much does it cost to replace a rear derailleur? #BicycleGearsAyoub Rhejjou15/janvier/2023 A derailleur is a mechanism that is used to move the chain from one gear to another on a bike. It is typically located at the rear of the bike a... Join Us Be the first one to receive new releases, special offers, and more Votre email S'inscrire100% free, Unsubscribe any time! Follow us