- 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
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.