Tire Codes: DOT & Load Index

Swapping tires, you spot 91V on the sidewall and wonder what it means. Type it in: 91 is the load index, 615 kg (1,356 lb) per tire, and V is the speed symbol, rated for 240 km/h (149 mph).

Tire Codes is an offline dictionary of the codes printed on a tire sidewall. Open it and today's code is already on the screen.

WHAT'S INSIDE
• Size designation: width, aspect ratio, construction and rim size (205/55 R16)
• Load index 0–279 in kilograms and pounds
• Speed symbols from A1 to Y, plus ZR and (Y)
• DOT date code: 2524 means week 25 of 2024
• 1,244 DOT plant codes from the NHTSA registry, with company, city and country
• E-mark approval numbers, XL, M+S, 3PMSF, TWI, UTQG grades, LT and C
• Run-flat markings, including the abbreviations tire makers print

HOW IT WORKS
• Search by code, name or value: 91, V, XL, 1HP, 615 kg, 240 km/h
• Save the codes you want to keep; the ones you opened recently stay at hand
• A five-question quiz on the codes every day
• Share any code as an image card

Tire Codes explains what the markings mean. It does not assess the condition of any tire.

DATA SOURCES
DOT plant codes: NHTSA vPIC (U.S. government public information). Load index and speed values: UN Regulations No. 30, 54, 106, 109 and 117 and U.S. federal regulations (49 CFR). Compiled and edited by Pentarab. This app is not affiliated with or endorsed by NHTSA, the U.S. Department of Transportation or any other government agency, or by any tire maker. Registry entries can be out of date; we make no guarantee that the information is accurate or complete.
Source: https://vpic.nhtsa.dot.gov/
Source: https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-574

Works offline. No account.

FREE AND PRO
Free: the first 20% of the list, today's code, search, related codes, 3 detail views a day, 1 saved code and 1 share card a day. Pro adds full notes for every marking and rating, unlimited share cards in high resolution, quizzes any time with stats and unlimited saves. One-time purchase.

Recent changes:
The data source now links to the official source.