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Methodology for performance measurements

The sources

Sources refer to a market player who carries out independent tyre comparison tests, based on a stable methodology and broad performance criteria, to provide objective results for a range of similar tyres according to the type of use.

Only the sources that respect the criteria are included in the base. These criteria are also applied for every test source.

The sources used to establish the performances for a tyre are:

  • Data from published tests from specialized media.

  • Data from Regulation (EC) 1222/2009 "on the labelling of tyres with respect to fuel efficiency and other essential parameters". Or the most widely observed label values (MOBS) in the absence of official values*.

  • Data published by independent test institutes.

A detailed list of the sources (not including Regulation (EC) 1222/2009) used to rate each product accompanies the display of test ratings.

The structure of the ratings

The final rating is divided into 9 basic performance criteria, and an additional 4 criteria for winter tyres.

The basic criteria are grouped into 5 performance categories: 3 for summer tyres, and 2 for winter tyres.

Within these categories, each performance criterion is weighted differently according to its importance.

The performance categories and the basic performance criteria are as follows:

General performance
Economy
  • Tyre life
  • Fuel economy
Comfort
  • Absorption of road irregularities
  • Dry handling
  • Road noise
Safety
  • Dry braking
  • Wet braking
  • Wet grip
  • Aquaplaning resistance
Winter performance
Snow
  • Braking on snow
  • Braking on snow
Ice
  • Braking on ice
  • Acceleration on ice

The methodology for the calculation

All basic performance criteria are rated according to the following principle:

  • A score of 10 is given to a tyre which achieves the best result for a given test.

  • The score given to other tyres decreases in proportion to the standard deviation of the selected discriminating factor.

  • All results that are 9 times higher than this standard deviation obtain the score of 1.

If the source uses its own rating (when it is not on a base of 10), a linear transcoding is performed

The final score for the basic performance is the arithmetic average of the scores obtained for each test.

Note: Tests conducted by car magazines or specialised bodies generally cover the most common tyre sizes available on the market. Even if performances vary slightly depending on sizes, we have chosen to apply the rating to all sizes for a tyre model.

The star rating system

The stars give a graphic overview of the score for a performance category. They are given according to the following scale:

The star rating system

* MOBS : Methodology to calculate the most widely observed label values

rezulteo score

The scores for all of the basic performance criteria are compiled to make 3 ratings for Economy, Comfort and Safety.

rezulteo score

These ratings are calculated by weighting the basic performance criteria:

  • Fuel economy and tyre life for the Economy rating

  • Absorption of road irregularities, dry handling and road noise for the Comfort rating

  • Aquaplaning resistance, dry braking, wet braking and wet grip for the Safety rating

For winter tyres, the overall tyre rating is calculated from the Economy, Comfort and Safety ratings as well as the Ice and Snow ratings.

  • The Ice rating is made up of the scores for acceleration on ice and braking on ice

  • The Snow rating is made up of the scores for acceleration on snow and braking on snow

An overall score can therefore be attributed by weighting the 3 different ratings previously calculated, plus the 2 winter ratings for winter tyres. This weighting is calculated based on the tyre size category: economic, high performance or sports.

Value for money sorting

The price-performance sorting is calculated on the basis of the ratio between the Rezulteo Score and the lowest price found. Tyres are ranked in descending order of this ratio.