Giti: Dekra independent results contradict magazine tyre test

Tuesday 15th March 2016 | 0 Comments

 
A photo illustrating the original ACE Summer tyre test 2016
A photo illustrating the original ACE Summer tyre test 2016

In response to a recent, less than favourable third party tyre test, Giti Tire has run two sets of independent tests with Dekra and “a leading German tyre testing association” to verify the wet braking performance of its GT Radial Champiro FE1 tyre. In the case of the original test, the Nexen Nblue HD Plus was chosen as the comparison product based on the reported results, which had this tyre as the test winner. Therefore Giti ran its tests using the same Nexen product as a comparison.

Dekra test

The first test, run by Dekra, took place in February 2016 at the IDIADA test facility in Spain. The vehicle used was a VW Golf 7 1.4L TSI 150hp manual, with ABS on, on 195/65 R15 91V tyres. Crucially, in light of Nokian’s recent admission of misrepresenting tyre test results and associated implications that other manufactures were/are doing the same kinds of things, Giti reports that all tyres were purchased on the open market from German dealers.

The wet braking tests were conducted on asphalt in zone 2, with the braking distance measured from 100 – 0 km/h. The track temperature was between 9 and 15.7 degrees Celsius. Each tyre was tested 10 times, with the first two runs discounted, leaving an average braking distance over eight runs (see  table 1 for details).

Table 1 – Dekra test, IDIADA

TYRE MANUFACTURER TYRE MODEL AVERAGE BRAKING DISTANCE
GT RADIAL Champiro FE1

DOT : 9UCY 00A 4915

41.75m
NEXEN Nblue HD Plus

DOT : UA9N JMLR 4715

40.30m
NEXEN Nblue HD Plus

DOT : UA9N JMAR 4714

41.40m

Source: Giti

German tyre test association

The second test was run by an as yet unnamed centre, which Tyres & Accessories understands is a “leading German tyre testing association” and took place in March 2016 at the ATP Papenburg facility in Germany. The vehicle used was a VW Golf 7 1.6TDI manual, with ABS on, on 195/65 R15 91V tyres. Like the previous test, all tyres were purchased on the open market by the testing association.

The wet braking tests were conducted over two days on ATP(D) BMK lane 4 and ATP(D) BMK lane 2, which have a different friction coefficient. The track temperature was between 7.9 – 12 degrees Celsius. Ambient temperature was around 10 degrees which is considered borderline for summer tyre testing, but tests continued at the request of Giti Tire based on “the urgent requirement for independent test results”.

Each tyre was tested eight times on both tracks with the braking distance measured from 100 – 0 km/h, leaving an overall average braking distance (see table 2).

Table 2 – ‘Leading test association’, ATP Papenburg

TYRE MANUFACTURER TYRE MODEL AVERAGE BRAKING DISTANCE
GT RADIAL Champiro FE1

DOT: 9UCY 00A 4915

53.70m
NEXEN

 

Nblue HD Plus

DOT : UA9N JMLR 4715

50.30m

Source: Giti

While neither tyre tests offer official grade for labelling purposes, the results suggest the GT Radial Champiro FE1 performed in accordance with a B rating in wet braking.

At the suggestion of the German tyre testing association an additional size of the FE1 was tested at the same time and under the same conditions to ensure that the pattern line performs on an expected level across the whole range, and the tyre performed in wet braking as expected.

Giti representatives commented that this first test in IDIADA showed only a 2.5 per cent difference in wet braking between the GT Radial and the Nexen, while in ATP the difference was 6.8 per cent. In best case single test the GT Radial was 6 per cent better than Nexen, in worse case there was a difference of 8 per cent.

Writing in a statement detailing the results, company representatives said: “What these independent tests immediately highlight is the major effect that all the various, sometimes uncontrollable differentials have on the results of a tyre test. Track surface, air and surface temperature, wind speed, recorded top and minimum speeds, brake disc temperature – everything has an influence on the outcomes and a tyre’s recorded performance at any given moment.

“However… the upshot is that the combined independent results in no way reflect those reported by the leading German automotive magazine, and we do not understand how the figures were achieved and how such a large difference was reported.”

Indeed, Giti believes the independent tests run by Dekra and the leading independent German tyre testing association “prove that the FE1, which was launched late 2014, has good wet safety performance…[and] is a very good tyre at its selected price point.”

Owing to the fact that Nexen products were used as the comparison tyre, Tyres & Accessories has contacted Nexen representatives in the UK, Germany and Korea for comment.

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