Wiktionary
gear ratio
n. The ratio of the speeds of rotation of the initial and final gears in a gear train.
Usage examples of "gear ratio".
There was a gear ratio to accommodate his slightest whim, and this did save him energy.
Second, when you have a gear ratio, say 2 to 1, and you are wondering whether you should make it 10 to 5 or 24 to 12 or 48 to 24, here's how to decide: You look in the Boston Gear Catalogue, and select those gears that are in the middle of the list.
A second control allowed them to spool the fiber up onto the take-up reel at a gear ratio of a thousand.
Studying the gear ratio, I calculated that the monster wouldn't be very quick.
She set the vehicle on the minimum gear ratio and started working backward.