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.
SRAM X-7 MTB REAR DERAILLEUR LONG CAGE 9 SPEED x.7 x7 3 x 9
 SRAM X-7 MTB REAR DERAILLEUR LONG CAGE 9 SPEED x.7 x7 3 x 9
$49.69
Time Left: 1h 52m
SRAM X-9 MTB REAR DERAILLEUR LONG CAGE 10 speed GREY x.9 x9 gray
 SRAM X-9 MTB REAR DERAILLEUR LONG CAGE 10 speed GREY x.9 x9 gray
$79.99
Time Left: 1h 53m
SRAM X-9 MTB REAR DERAILLEUR LONG CAGE 10 speed WHITE 2 x 10 x9
 SRAM X-9 MTB REAR DERAILLEUR LONG CAGE 10 speed WHITE 2 x 10 x9
$85.00
Time Left: 1h 53m
SRAM X-9 MTB REAR DERAILLEUR LONG CAGE 8 9 SPEED x9 3 x 9
 SRAM X-9 MTB REAR DERAILLEUR LONG CAGE 8 9 SPEED x9 3 x 9
$67.00
Time Left: 1h 53m
SRAM X-9 MTB REAR DERAILLEUR MEDIUM CAGE 10 speed GREY 2 x 10
 SRAM X-9 MTB REAR DERAILLEUR MEDIUM CAGE 10 speed GREY 2 x 10
$94.99
Time Left: 1h 53m
SRAM X-9 MTB REAR DERAILLEUR MEDIUM CAGE 8 9 SPEED x 9 x9 x.9 3 x 9
 SRAM X-9 MTB REAR DERAILLEUR MEDIUM CAGE 8 9 SPEED x 9 x9 x.9 3 x 9
$72.99
Time Left: 1h 53m
SRAM X7 Front Derailleur 3 X 10 x.7 New MTB 3x10 High Clamp Dual Pull
 SRAM X7 Front Derailleur 3 X 10 x.7 New MTB 3x10 High Clamp Dual Pull
$52.95
Time Left: 1h 53m
[Bi_King] SHIMANO XTR FD-M980 LOW CLAMP 3x10 MTB FRONT DERAILLEUR
 [Bi_King] SHIMANO XTR FD-M980 LOW CLAMP 3x10 MTB FRONT DERAILLEUR
$99.99
Time Left: 2h 7m
derailleur hanger for 2010 GIANT Reign MTB D214 Pilo
 derailleur hanger for 2010 GIANT Reign MTB D214 Pilo
$16.00 (1 Bids)
Time Left: 5h 7m
NEW SRAM X-9 Mountain Bike Front Derailleur 9 Speeds 35mm Bicycle XC
 NEW SRAM X-9 Mountain Bike Front Derailleur 9 Speeds 35mm Bicycle XC
$29.99
Time Left: 6h 30m
SHIMANO XT SHORT CAGE MOUNTAIN BIKE DERAILLEUR REAR RD-M735
 SHIMANO XT SHORT CAGE MOUNTAIN BIKE DERAILLEUR REAR RD-M735
$10.49 (5 Bids)
Time Left: 7h 22m
SHIMANO LX DEORE MOUNTAIN BIKE DERAILLEUR FRONT 28.6 FD-M563
 SHIMANO LX DEORE MOUNTAIN BIKE DERAILLEUR FRONT 28.6 FD-M563
$12.50 (8 Bids)
Time Left: 7h 40m

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.

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