Adjusting the gears on a bicycle is an important skill for any cyclist. It allows you to change the gear ratio, which affects how easily you can pedal and how fast you can go. There are two main types of gears on a bicycle: derailleur gears and hub gears.
Derailleur gears are the most common type of gears on bicycles. They use a series of gears and chains to change the gear ratio. Hub gears are enclosed within the rear hub of the bicycle and use planetary gears to change the gear ratio.