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Understanding Tyre Sidewall Markings
1. Brand or trade name of the tyre - i.e. Continental, Dunlop, Goodyear, Michelin, Pirelli etc.
2. Tyre model or pattern code. For example Sport, Pilot, Eagle etc
3. Tyre size - The width of the tread expressed in millimetres, which in this illustration is 205; the aspect ratio - height of the tyre sidewall as a percentage of the width, in this case it is 55% of 205mm; and the diameter of the tyre's centre hole, expressed in inches. In this illustration, it is 16". The letter between the numbers is the type of construction i.e. ‘R' Radial. So this tyre is a 205/55 R 16
4. Service description - in this example the figure 91 denotes the maximum weight capacity of the tyre according to the official load index table, which translates to 615 Kg, The letter V indicates the speed rating of the tyre, in this case the tyre suitable for cars capable of reaching a maximum vehicle speed of 149.1 mph.
5. ECE (Economic Commission for Europe) Regulation 30 Conformity Approval Number - which means that the tyre meets the standards of the European Regulatory Authorities.
6. EEC Noise Approval Number, which means that the noise generated by the tyre is within approved European limits.
7. Department of Transport manufacturer's code. This has no relevance to the UK market
8. Date of manufacture. This is important as the age of a tyre can affect its performance. The first 2 numbers refer to the week and the 3rd and 4th numbers refer to the year
9. USA UTQG (Uniform Tire Quality Grade) ratings. This has no significance in the UK.
10. USA maximum tyre loading. This has no significance in the UK
11. USA maximum tyre inflation pressure. This has no significance in the UK
12. Denotes tubeless construction
13. Safety warning refers to the dangers of under-inflation/overloading and the mounting of tyres together with the risk of severe over - inflation. This is particularly important as TyreSafe research shows that up to three quarters of cars on UK roads have incorrectly inflated tyres
14. Direction of rotation which relates to directional tyres only. These tyres are designed to rotate in one direction only which is indicated on the sidewall by an arrow.
15. Outer/inner sidewall refers to the mounting of asymmetric tyres only. These tyres have different tread patterns on their inner and outer sides, offering improved performance, and must be fitted correctly.
16. Extra load version where applicable
17. TWI indicates the location of the tread wear indicators, which are raised areas at the base of the tread to serve as a visual warning that the tyre is approaching or at the minimum legal tread depth.