Bike derailleurs are what makes bike chains work smoothly and produce energy efficiently, mainly by keeping the chain intact and your bike ready for more action even with the changing terrains. The bike derailleurs are composed of many parts including cogs, bike chains, sprockets of different sizes and the two pulleys.
Basically, there are three types of bike derailleurs. Riders who want to customize their bikes in a specific kind of terrain may want to choose the front derailleur. This type allows the chain to move smoothly up and down the chainrings. Shimano has this kind of derailleurs that are also compatible with just any bike model. A rear derailleur, on the other hand, facilitates a vertical, even motion of the chain as it moves along. Free ride mountain bikes usually prefer these bike derailleurs as it can assure more stability in the chainring even with an unfriendly slope. The SRAM Dual Drive fits under this model. This model is designed to withstand tremendous shifting tension. Mountain bikers usually would prefer to use the long cage derailleurs for its triple-set bike cranksets.
Usually, a biker would want to change or upgrade his/her bike derailleurs or bike skewers for added performance. Most of the new derailleurs are made of lightweight material intended to create less noise and to make changing gears easier and ensuring all bike wheels ride smoothly. However, the biker should also consider his comfort and familiarity with the newly-installed bike derailleurs. It is also helpful to observe proper ways in lubricating and maintaining the condition of the bike derailleurs while it lasts.