| HOW THE PEDALS AND GEARS WORK |  |
Pedals and gears are simple machines. The chain of a bike goes in a continuous circle around one big sprocket wheel and any one of five small sprocket wheels of different sizes. When the rider changes gears, the selector mechanism called the derailleur moves the chain to the correct sprocket wheel.
| This picture shows the derailleur. |  |
The smaller sprocket wheel turns quicker than the big one, but needs more force to make it turn. In other words, the smaller the sprocket wheel, the harder it is for you to pedal.
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