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A derailleur on a mountain bike, also called a hybrid bike, essentially performs the same function as on any other bike equipped with gears. Here is a description of its function, its characteristics and the associated standards:

Function :

The derailleur on a mountain bike allows you to change speed by moving the chain from one chainring to another at the front and from one cog to the other at the rear. This allows pedaling resistance to be adjusted based on speed, terrain and rider strength.

Features :

1. Versatility:

Mountain bike derailleurs are designed to offer a wide range of speeds to adapt to different types of terrain, whether on the road, on a cycle path or on a dirt road.

2. Reliability:

They are often designed to be sturdy and reliable, as mountain bikes are often used in a variety of conditions and may be subject to varying loads.

3. Compatibility:

Mountain bike derailleurs are designed to be compatible with drivetrain systems commonly used on these types of bikes, which may include multi-speed cassettes in the rear and multiple chainrings in the front.

4. Easy maintenance:

They are generally designed to be easy to maintain, with simple adjustments to ensure smooth and precise shifting.


Derailleurs on mountain bikes generally follow bicycle industry standards for compatibility with cassettes, chainrings, chains and shifters. However, there may be variations depending on the manufacturer and specific model of the derailleur.

In summary, mountain bike derailleurs are designed to offer great versatility, reliability and ease of maintenance, while following industry standards for optimal compatibility with other components of the bicycle drivetrain system.