The correct adjustment of the derailleur on the bike can be crucial to enjoy or feel great frustration while riding. If the adjustment is not done correctly, the chain will not jump to the desired chainring, but will instead "hang" or completely come off the chainring.
The derailleur takes care of moving the chain to change the projection (distance traveled when making a full turn of the bottom bracket) depending on the level of the rider and the difficulties of the route. The rear derailleur takes care of shifting gears (or sprockets) on the cassette. Unlike BMX (a single speed and a single chainring), on an MTB you can find up to 11 sprockets; The purpose of the rear derailleur is to move the chain from one sprocket to another.
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