The rear derailleur is an essential component of the multispeed bicycle. Unlike single-speed BMX bikes, the mountain bike requires a rear derailleur to shift or "derail" the chain between the sprockets of the free wheel. According to Web Mountain Bikes, the rear derailleur is controlled with the right shifter lever of the mountain bike. The mountain bike's rear derailleur varies slightly from the rear derailleur of the road bike.
Construction
The rear derailleurs of the road bike and mountain bike are often constructed with similar materials. Both feature a durable design made from metals and alloys. According to "Bike Magazine," top-rated models of the mountain bike rear derailleur feature a forged aluminum construction. High-end rear derailleurs for the road bike often have titanium construction. While titanium rear derailleurs feature a more lightweight design, they cost more than aluminum models.
Components
The rear derailleur has an internal retention spring. Compared to the road bike, the mountain bike rear derailleur has a tighter retention spring. The increased tightness prevents the derailleur from shifting out of position as you navigate a bumpy off-road terrain. Mountain bike rear derailleurs often feature a longer swing arm than road bike rear derailleurs. The elongated swing arm helps to ensure quick shifts during high-speed downhill maneuvers.
Weight
The weight of the mountain bike rear derailleur fluctuates, based on the materials used in the construction process. According to Vital MTB, top-rated models of the mountain bike rear derailleur weigh in at around 200 g. Compared to the rear derailleur of the road bike, the mountain bike rear derailleur is often slightly heavier. The added weight helps increase the speed of the mountain bike during downhill maneuvers.
Cassette System
The cassette system of the mountain and road bike differ, based on the number and sizes of the sprockets. The mountain bike rear derailleur has been designed for a 10-speed cassette system. The rear derailleur of the mountain bike allows you to adapt to the gradient of the off-road trail. The rear derailleur featured on the road bike is designed for a 13-speed cassette system, which allows you to choose between a variety of gearing options.
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