How old is too old for a tire?

The general consensus among major tire manufacturers (like Michelin and Continental) and safety organizations is that tires should be replaced at 6 years of age, and absolutely must be replaced by 10 years of age, regardless of tread depth.

Can a 10 year old tire look brand new?

Yes. A 10-year-old tire that was kept in the trunk as a spare or parked in a garage might have perfect tread and look brand new. However, the internal rubber compounds have still degraded and oxidized, making it extremely prone to a blowout if driven at speed.

How do I read the 4 digit DOT code?

The first two numbers indicate the week of the year (01 through 52), and the last two numbers indicate the year. So, a code of "4122" means the 41st week of the year 2022.

Do trailer tires age faster than car tires?

Yes. Because trailers often sit outside in the sun without moving for months at a time, the tires degrade from UV exposure faster than a daily-driven car tire. ST (Special Trailer) tires should strictly be replaced every 3 to 5 years.

Does tire age start from manufacture date or purchase date?

Tire age always starts from the manufacture date stamped on the sidewall, not the date you purchased them. If you buy "new" tires from a shop that have been sitting in their warehouse for 3 years, they only have 3 years of primary service life left.

Tire Age Calculator

Enter the 4-digit date code from your tire to calculate its exact age in years and months.

Quick Answer

Entering the DOT code "2221" shows the tire was manufactured in the 22nd week of 2021 (late May). As of 2026, this tire is 5 years old. It receives a "Monitor Closely" verdict because it is approaching the industry-standard 6-year replacement age and should be inspected for dry rot.

Enter DOT date code (last 4 digits)

Look on the tire sidewall for DOT … XXYY — enter the last 4 digits (week + year)

Typical Tire Age by DOT Year (Current Year: 2026)

DOT Year Code	Year Manufactured	Current Age	Safety Status
ending in "25"	2025	1 Year Old	Excellent / Safe
ending in "23"	2023	3 Years Old	Good / Safe
ending in "20"	2020	6 Years Old	Approaching Limit
ending in "18"	2018	8 Years Old	High Risk / Replace Soon
ending in "15"	2015	11 Years Old	Expired / Unsafe
ending in "09"	2009	17 Years Old	Critically Dangerous

Formula

Age = Current Date − (Manufacture Week + Manufacture Year)

Manufacture Week = first two digits (01–52)
Manufacture Year = 2000 + last two digits
Example: Code "1020" = March 2020 → exactly 6 years old in 2026
Replace at 6 years — rubber degrades chemically regardless of tread depth or appearance

Frequently Asked Questions

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UTQG Tire Rating Decoder Tire Treadwear Rating Comparison DOT Year Code Reference Chart Full Tire DOT Code Decoder

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