Tire Certification Marking Comparator
Compare certification markings on two tires: DOT, E-mark, R117 suffixes, 3PMSF, M+S, CCC and INMETRO, with what each mark proves.
Compare reported certification markings.
Tire Certification Marking Comparator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Tire Certification Marking Comparator Works?
The Tire Certification Marking Comparator compares the marks on two tire sidewalls. It lists marks shared by both tires and marks found on only one. Follow the 3 steps below.
Read both sidewalls
Note every marking, for example DOT, E4, s2w suffix, 3PMSF and M+S.
Enter the markings
Tick each mark found on Tire A and Tire B.
Compare
The comparator lists shared marks, missing marks and the market or test each mark covers.
Tire Certification Marking Comparator Formula
The Tire Certification Marking Comparator uses set comparison: Shared = A ∩ B, Only A = A − B, Only B = B − A.
S = M_A ∩ M_BU_A = M_A − M_BU_B = M_B − M_A- M_A, M_B
- Set of markings on each tire
Worked example
Tire A carries DOT, E4, s2w, M+S and 3PMSF. Tire B carries DOT, E4 and M+S. The comparator returns 3 shared marks and shows that only Tire A passed the snow traction test.
Tire Certification Marking Comparator Conversion Table
The Tire Certification Marking Comparator conversion table explains 8 certification and performance markings found on tire sidewalls.
| Marking | Region | Meaning | Example |
|---|---|---|---|
| DOT + code | United States | FMVSS compliance self-certified by maker | DOT 4B 9T ABC 3323 |
| E-mark (E4 …) | UNECE countries | Type approval under UN R30 / R54 | E4 0251234 |
| e-mark + S/W/R suffix | European Union | UN R117 noise (S), wet grip (W), rolling resistance (R) | e4 0212345-s2w |
| 3PMSF | Global | Passed snow traction test | Mountain with snowflake |
| M+S | Global | Tread design for mud and snow, no test | M+S |
| CCC | China | China Compulsory Certification | CCC logo |
| INMETRO | Brazil | National conformity mark | INMETRO logo |
| ICE GRIP | Europe | Passed UN R117 ice test | Mountain with ice symbol |
What is Tire Certification Marking Comparator?
A Tire Certification Marking Comparator is a tool that compares the legal and performance markings on 2 tires. Markings show which markets a tire is approved for and which standardized tests the tire passed.
Certification marks are market-specific. A tire with only a CCC mark is not approved for EU roads, and a tire without a DOT code is not legal for sale in the United States.
Performance marks differ from certification marks. 3PMSF proves snow traction. M+S describes tread design only.
What are the uses of Tire Certification Marking Comparator?
There are 4 main uses of the Tire Certification Marking Comparator, including import checks and winter rule checks.
Import checks
Confirm an imported tire carries the local approval mark.
Winter rule checks
Confirm 3PMSF where winter laws require the mark.
Inspection prep
Check marks before a roadworthiness test.
Grey market detection
Spot tires made for another market.
Related Ratings, Testing & Mass Tools
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Compare noise measurements under matched protocols.
Compare published winter test results.