The gear ratio of this gear train is 1 to 3. Remember, idler gears do not affect the gear ratio between the input and output gear no matter how many idler gears there are.

The output gear rotates in the opposite direction as the input gear. This is because there are an even number of gears in the entire gear train (6 in all). If there were an odd number of gears, then the input and output gears would rotate in the same direction.

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See also: Gears, Spur gear