So I am dealing with this right now on my truck, and considering how expensive a new set of tires is, I want to get the maximum use out of my tires before replacing them.
So after a bit of research I found two things to consider.
1. Many tires have a wear indicator (just a piece of rubber) that goes between the treads. When that starts wearing down, it’s time to replace those tires.
Here is a short video I made showing the wear indicators on my truck:https://www.youtube.com/watch?v=6RhLGKUo6QI
2. The penny technique. Take a penny, turn it upside and put it in your treads. If you can see the tip of Abe’s head, time to replace the tread.
Here is a video with the penny technique:https://www.youtube.com/watch?v=AOaeBNU9lnE