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Try to keep the chain in a straight line. If it’s not, you should be able to hear it.  

Most bikes have gears. They help make your pedaling consistent whether you are going uphill or down.

Here’s what you need to know about gears. 

1. When it is getting harder to pedal, shift into an easier, lower gear. Each revolution will propel the bike a short distance, but it will take less effort to push the pedals.
2. When it’s getting easier to pedal, you’ll want to be in a harder, higher gear. Each revolution will propel the bike a long distance, but the effort is very high.
3. On flat ground, you’ll want to be in the middle of your range of gears. 

For best results, the chain needs to be in a generally straight line. If the chain isn’t in a straight line, you should be able to hear it.