http://www.legislation.gov.uk/eur/2011/228/annex/division/AppendixCommission Regulation (EU) No 228/2011 of 7 March 2011 amending Regulation (EC) No 1222/2009 of the European Parliament and of the Council with regard to the wet grip testing method for C1 tyres (Text with EEA relevance)Commission Regulation (EU) No 228/2011Commission Regulation (EU) No 228/2011 of 7 March 2011 amending Regulation (EC) No 1222/2009 of the European Parliament and of the Council with regard to the wet grip testing method for C1 tyres (Text with EEA relevance)2021-02-11King's Printer of Acts of Parliamenthttps://webarchive.nationalarchives.gov.uk/eu-exit/https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32011R0228texttext/xmlen2011-03-07 ANNEX

Appendix A <Strong>Test reports examples of wet grip index</Strong> 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):

No12345678910
Size
Service description
Tyre identification
Rim
Pattern
Load (N)
Pressure (kPa)
μpeak1
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

No12345
BrandUniroyalTYRE BTYRE CTYRE DUniroyal
PatternASTM F 2493 SRTT16″PATTERN BPATTERN CPATTERN DASTM F 2493 SRTT16″
SizeP225/60R16SIZE BSIZE CSIZE DP225/60R16
Service description97SLI/SSLI/SSLI/SS97S
Tyre identificationXXXXXXXXXYYYYYYYYYZZZZZZZZZNNNNNNNNNXXXXXXXXX
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/s2)Braking distance(m)Average deceleration(m/s2)Braking distance(m)Average deceleration(m/s2)Braking distance(m)Average deceleration(m/s2)Braking distance(m)Average deceleration(m/s2)
Measurement1
2
3
4
5
6
7
8
9
10
Average AD (m/s2)
Standard deviation (m/s2)
Validation of results Coeff. of variation (%) < 3 %
Adjusted average AD of ref. tyre: R a (m/s2)
BFC(R) reference tyre (SRTT16″)
BFC(T) candidate tyre
Wet grip index (%)