0 a type of bicycle gear that works by moving the bicycle chain from one sprocket wheel (= a wheel with a row of tooth-like parts) to another -- (自行车的)换挡装置,变速器
Meeting both these requirements is only possible if the rear derailleur is compatible with the gear range being used on the bike.
A hub gear system provides greater ease-of-use and safety than a derailleur system, can provide a wide range of ratios, and requires little maintenance.
The others had derailleur gears for a higher ratio for the sprint.
This requires a sprung chain tensioner, similar to a rear derailleur, to be used.
His victory was controversial as he was the first rider to complete the race using a modern derailleur.
Though they are heavier than comparable derailleur systems, internal-gear hub systems generally last longer and require less maintenance.
Shifter controls are mounted so that the right shifter controls the rear derailleur and the left shifter controls the front derailleur.
Its products ranged from suspension forks to derailleurs.