Derailleurs

 
The derailleur is the device that changes gears by moving the chain from one sprocket to another. There are two derailleurs: one on the rear and one on the front. The highest ratio (when the bike can go fastest) is produced when the chain is on the biggest sprocket in the front and the smallest in back. The lowest ratio (the bike is easiest to pedal up hills, but very slow) is produced when the chain is on the smallest sprocket in front and the biggest in back.
VINTAGE Mountain Bike SHIMANO Rapid fire plus Shifters
VINTAGE Mountain Bike SHIMANO Rapid fire plus Shifters
$9.95 (1 Bids)
Time Left: 21h 37m
New Shimano Deore FDM510 Front Derailleur Mountain Bike
New Shimano Deore FDM510 Front Derailleur Mountain Bike
$0.99 (1 Bids)
Time Left: 23h 21m
Shimano LX M581 Mountain Bike Front Derailleur - 34.9mm
Shimano LX M581 Mountain Bike Front Derailleur - 34.9mm
$13.49
Time Left: 23h 42m
Shimano LX M580 Mountain Bike Front Derailleur - 34.9mm
Shimano LX M580 Mountain Bike Front Derailleur - 34.9mm
$13.49
Time Left: 23h 42m
Shimano SLX M660 Mountain Bike Front Derailleur 34.9mm
Shimano SLX M660 Mountain Bike Front Derailleur 34.9mm
$17.99
Time Left: 23h 42m
Shimano XT FD-M770 Mountain Bike Front Derailleur
Shimano XT FD-M770 Mountain Bike Front Derailleur
$37.87
Time Left: 1d 4h 6m
SRAM X-Gen Front Derailleur New 34.9 for Mountain Bike
SRAM X-Gen Front Derailleur New 34.9 for Mountain Bike
$4.99 (0 Bids)
Time Left: 1d 19h
Shimano LX M580 Mountain Bike Front Derailleur - 34.9mm
Shimano LX M580 Mountain Bike Front Derailleur - 34.9mm
$8.99 (0 Bids)
Time Left: 1d 23h 4m
Shimano LX M580 Mountain Bike Front Derailleur - 34.9mm
Shimano LX M580 Mountain Bike Front Derailleur - 34.9mm
$13.49
Time Left: 1d 23h 45m
Shimano LX M581 Mountain Bike Front Derailleur - 34.9mm
Shimano LX M581 Mountain Bike Front Derailleur - 34.9mm
$13.49
Time Left: 1d 23h 45m
Shimano SLX M660 Mountain Bike Front Derailleur 34.9mm
Shimano SLX M660 Mountain Bike Front Derailleur 34.9mm
$17.99
Time Left: 1d 23h 45m
Vintage Shimano Deore rear Derailleur MTB Mountain Bike
Vintage Shimano Deore rear Derailleur MTB Mountain Bike
$4.99 (0 Bids)
Time Left: 2d 13m

In general, a derailleur is a mechanical means for moving the bicycle's chain from one cog to an adjacent cog, of a different size, so as to change the gearing of the bicycle. Bicycles equipped with derailleurs and multiple cogs - typically a group on the rear hub, and another group on the pedal crankset - allow for changing the gearing while the bicycle is in motion, which means that the rider can adjust the 'ease of pedaling' to suit the load being carried/pulled, to suit the immediate terrain, or to accommodate for other factors such as a headwind or the surface on which the bicycle is being ridden.

Sponsored Links