Large front gear, small rear gear and high speed ratio. When the big gear rotates once, the small gear can rotate several times more, that is, the wheel rotates several times more.

Is there a relationship between the number of bicycle gears and the speed? What does it matter?

This is very important. The front-rear gear ratio is high, and the bicycle speed is fast.

How to calculate the distance that a bicycle travels once?

The distance of a cycle is equal to 3. 14 times the diameter.

How many times does the front gear turn once and the rear gear turn once?

It can be calculated according to the tooth ratio of front and rear gears.