# Regulation (EC) No 1222/2009 of the European Parliament and of the Council of 25 November 2009 on the labelling of tyres with respect to fuel efficiency and other essential parameters (Text with EEA relevance), Appendix A

Extent: E+W+S+N.I.

Test reports examples of wet grip index
EXAMPLE 1:
Test report of wet grip index using trailer method
Test report number:
Test date:
Type of road surface:
Texture depth (mm):
μ peak (SRTT14″ E 1136):
BPN:
Speed (km/h):
Water depth (mm):
No
1
2
3
4
5
6
7
8
9
10
Size
Service description
Tyre identification
Rim
Pattern
Load (N)
Pressure (kPa)
μ peak
1
2
3
4
5
6
7
8
Average
Standard deviation σ
(σ/average) ≤ 5 %
Ra, Adjusted
Wet grip index
Surface temp. (°C)
Ambient temp. (°C)
Remarks
EXAMPLE 2:
Test report of wet grip index using passenger car method
Driver:
Test date:
Track:
Passenger Car:
Initial speed (km/h):
Texture depth (mm):
Brand:
Final speed (km/h):
BPN:
Model:
Water depth (mm):
Type
No
1
2
3
4
5
Brand
Uniroyal
TYRE B
TYRE C
TYRE D
Uniroyal
Pattern
ASTM F 2493 SRTT16″
PATTERN B
PATTERN C
PATTERN D
ASTM F 2493 SRTT16″
Size
P225/60R16
SIZE B
SIZE C
SIZE D
P225/60R16
Service description
97S
LI/SS
LI/SS
LI/SS
97S
Tyre identification
XXXXXXXXX
YYYYYYYYY
ZZZZZZZZZ
NNNNNNNNN
XXXXXXXXX
Rim
Front axle pressure (kPa)
Rear axle pressure (kPa)
Front axle load (N)
Wet surface temp (°C)
Ambient temp (°C)
Braking distance (m)
Average deceleration (m/s 2 )
Braking distance (m)
Average deceleration (m/s 2 )
Braking distance (m)
Average deceleration (m/s 2 )
Braking distance (m)
Average deceleration (m/s 2 )
Braking distance (m)
Average deceleration (m/s 2 )
Measurement
1
2
3
4
5
6
7
8
9
10
Average AD (m/s 2 )
Standard deviation (m/s 2 )
Validation of results
Coeff. of variation (%) < 3 %
Adjusted average AD of ref. tyre:
R a (m/s 2 )
BFC (R) reference tyre (SRTT16″)
BFC (T) candidate tyre
Wet grip index (%)

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Source: https://www.legislation.gov.uk/eur/2009/1222/annex/V/appendix/A (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-1222/annex-V/appendix-A
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.