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Appendix A F1

United Kingdom

Original text. Later amendments are not shown.

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 (%)

Annotations

Textual amendments

F1

Inserted by Commission 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).