Nowadays the shaft system has started to become well known with extra conveniences. Previously bikes used to have leather belts but now are commonly made of rubbers. Therefore these belts act very similar to a metallic chain. Derailleur: an assembly of levers, commonly cable actuated, that moves the chain among https://bikeenginesexplained15924.webbuzzfeed.com/35500425/indicators-on-bike-part-diagram-you-should-know