Repeat on the back side of your tires - make sure that you are measuring the distance between the same feature. (mechanics.stackexchange.com)
To make sure the tires are inflated correctly, find the intended air pressure range for each tire, which is usually printed on the smooth side of the tire (not the treads). (health.com)
I needed a new tire due to a nail and glass in opposite sides of tire and said it co... (cars.com)