How to Calculate Your Rear Gear Ratio

https://uzbasicmotorsports.com/
In this video I will show you how to calculate the rear gear ratios in your rear end without taking anything apart, just jacking up the rear wheels. So what we did here was put a piece of tape on the rear tire right here, and a piece of painters tape over here an the fender, to mark the location of the tire.
What we're going to do is we're going to go one full revolution all the way around and end up back exactly with these tape marks lined back up.

This video was influenced by https://www.youtube.com/watch?v=uU6WJXjZf4Y