What does the term "gear ratio" refer to in vehicle mechanics?

The term "gear ratio" in vehicle mechanics refers to the relationship between the rotations of the engine and the rotations of the wheels. It expresses how many times the engine must rotate to make the wheels turn a certain number of times. This ratio is crucial because it affects the vehicle's acceleration, top speed, and overall performance.

A higher gear ratio means that the engine can provide more torque to the wheels, which is beneficial for tasks requiring higher pulling power or acceleration, making it ideal for heavy loads. Conversely, a lower gear ratio can lead to higher speeds but less torque. Understanding gear ratios helps mechanics optimize the performance of a vehicle based on its intended use.

The other options do not relate to the concept of gear ratio. Idle speed refers to engine performance when the vehicle is stationary, suspension strength pertains to the vehicle's ability to absorb shocks, and weight distribution affects handling and stability but does not relate to the rotational mechanics of the engine and wheels.