There is a front and a rear derailleur on your bike. The front one moves the chain on the front chainrings. The rear one moves the chain on the rear freewheel. They work in conjunction with your shifters.
those things that move the chain and change gears, one in the front and one in the back.
(D-Rail-Yur) This is the bike part which moves the chain into a different gear when you click the shifter. The front derailleur shifts at the chainrings/crank and the rear derailleur shifts on the cogs on the rear wheel.
a mechanical device that moves the chain over the cogs or chainrings, changing gears.
a device to switch the gears, controlled by shifters attached to the handlebars
Device that moves the bike chain from one sprocket to another in order to change gears.
A part of the bicycle's drive train which changes position, in conjunction with the shifter, in order to move the chain to a different gear. There are front and rear derailleurs. The rear is also used to take up the chain slack.
The mechanism that allows you to shift the chain into another gear.
Front and rear gear changing devices that move the chain across the cassette and the front chainrings. Derailleurs are operated by pressing the shifters to move the derailleur cables.
The mechanism that moves the chain from one gear to another.
n. the parts that move the chain and change gears, one in the front and one in the rear.
System used to change gear seamlessly.
a lever-activated mechanism that pushes the chain off of one sprocket and onto another, thus changing the gear ratio
The mechanism which moves the chain from one chainring or sprocket to another.
Those odd metal gadgets that move the chain and change gears, one in the front, one in the back.