# gear ratio

- the ratio of the rotational speeds of the first and final gears in a train of gears or of any two meshing gears.
- the ratio of the diameters of the pitch surfaces of any two meshing gears or of the numbers of their teeth.

## Origin of gear ratio^{}

First recorded in 1905–10

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for gear ratio

### Historical Examples

#### In expressing the gear-ratio, the normal speed will be denoted by 100.

#### The gear-ratio of a two-speed gear is the ratio of the high to the low gear.

#### When the central pinion is held stationary the hub is driven at a less speed than the chain-wheel; the gear-ratio is 100 : 76.2.