What is indicated by a drive gear with a smaller diameter and fewer teeth compared to the driven gear?

A drive gear with a smaller diameter and fewer teeth in comparison to the driven gear indicates gear reduction. In a gear reduction system, the input gear (the drive gear) turns more times to turn the output gear (the driven gear) fewer times. This is because the driven gear has a larger diameter and more teeth, requiring more effort to turn it.

This setup is commonly used to increase torque while reducing speed, which is essential in applications requiring more power to be delivered to the wheels, such as in starting motion or climbing inclines. The relationship between the sizes and number of teeth directly influences the mechanical advantage produced by the gearing system, allowing for effective manipulation of speed and torque to suit the vehicle's operational needs.