The ‘aspect ratio’ of the sidewall height to the total width of the tire, as a percentage.If no information is provided, it is assumed to be 82%.To find your tire's date code, identify the code on the tire that begins with 'DOT'.
My primary purpose in these articles is to help people understand tires and thereby reduce the risks we all face every day.You will find the 4-digit date code following this set of letters and/or numbers. If your tire is older than 3-5 years, be sure to check the trailer tire for dry-rot as it may be time to replace your trailer tires. Please take a look at our Trailer Tire Options if it is time for your's to be replaced. Dunlop has a long history of making tires, dating back to when the founder John Boyd Dunlop secured a U. In 1920 Dunlop tire broke ground in Buffalo, New York, bringing the first tire manufacturing facility to the U. Being the only manufacturer producing tires in the U.Prior to April of 2015, all plant codes were 2 digits, but after April of 2015, a third digit was permissible, and 3 digits are required by April of 2025.This means there will be a period of time where there will be both 2 digit and 3 digit plant codes.Example of a tire manufactured since 2000 with the current Tire Identification Number format: While the entire Tire Identification Number is required to be branded onto one sidewall of every tire, current regulations also require that DOT and the first digits of the Tire Identification Number must also be branded onto the opposite sidewall.