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CAR WORLD


DISCOVER THE TIRE MARKINGS


In addition to the tire size and the service description, on the tire sidewall there are several different inscriptions: let's have a look at some of them.

Brand and Product Name

BrandProduct Name


Construction Type

Construction Type
 

This example shows a typical tubeless radial tire.


Side Indication

Side Indication
 

For all asymmetric products it is important to fit the tire on the rim in the correct position. In fact asymmetric tread pattern designs are developed to offer the best performance considering the different behaviours of the external and internal areas of the tread design.


DOT Safety Standard Codes

DOT Safety Standard Codes
 
 
DOT Safety Standard Codes
 

DOT (Department Of Transportation) is a legal marking required in many countries in order to sell the tyres. DOT means the tires meet or exceed the Department of Transportation’s safety standards.

1) Means tire meets or exceeds Department of Transportation safety standards
2) Manufacturer and Plant Code Number (Assigned by DOT)
3) Tire Size Code Number
4) Group of Optional Symbols for the Manufacturer ( To identify the brand or other significant characteristics of the tire)
5) Date of manufacture


ECE Homologation

ECE Homologation
 

When a tire bears the ECE symbol, this means it is ECE certified and approved to meet ECE standards for physical dimensions, branding requirements and high speed endurance regulations. The marking is made up of the letter E and a number representing the country releasing the approval sheet, followed by a unique number combination for each product.


European Noise Homologation

European Noise Homologation
 

When a tire bears the European Noise Approved number this means it is compliant with Directive 2001/43/EC, respecting the new noise emission levels set for the European countries.


U.T.Q.G.(Uniform Tire Quality Grading)

U.T.Q.G.(Uniform Tyre Quality Grading)
 

UTQG is a standard defined by the DOT of the USA for grading the performances of tires in the areas of TREADWEAR, TRACTION and TEMPERATURE RESISTANCE. It applies only to car tires with a rim diameter of 13" and larger, but not to winter tires.

TREADWEAR: The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 would wear one and one-half times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate.

TRACTION: The traction grades, from highest to lowest, are AA, A, B, and C. These grades represent the tyre's ability to stop on wet roads as measured under controlled conditions on specified government test surfaces of asphalt and concrete. A tyre marked C may have poor traction performance. Caution: the traction grade assigned to the tyre is based on straight-ahead braking traction tests, and does not include acceleration, cornering, aquaplaning, or peak traction characteristics.

TEMPERATURE: The temperature grades are A (the highest), B, and C, representing the tire's resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. Grade C corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law. Caution: the temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, under inflated tires, or excessive loads, either separately or in combination can cause heat build-up and possible tire failure.


T.W.I. (Tread Wear Indicator)

T.W.I. (Tread Wear Indicator)

TWI is an important safety feature that easily allows how much tread is left on the tire to be verified. Narrow bars of rubber are moulded at a height of 1.6 mm (2/32”) across the bottom of the tread grooves. When the tread wears down to these bars, the tire should be replaced.


M+S (Mud & Snow) and Snowflake Marking

M+S (Mud & Snow) and Snowflake Marking

Winter tires, also called snow, cold weather or thermal tires, and identified by the branding M+S (Mud&Snow) on the side of the tires together with the drawing of a mountain with a snowflake. Legally the M+S marking alone is sufficient to identify a winter tyre, but the tire industry has adopted the snowflake marking to differentiate real winter tires (M+S and snowflake) from all-season tires (only M+S).