1. Informal Working Group Tyre GTR
Document TYREGTR-22-04
Agenda item 4.3 AI IWG21/11
Informal Working Group Tyre GTR
Session 22, Brussels March 4th-5th
Action item IWG21/11
Industry will investigate the correct referencing in 3.18 (deadline: next IWG)
It is also suggested to review the calculations of metric‐A sizes.

2. R30/R54 Approach
6. REQUIREMENTS
6.1. Dimensions of tyres
Section width of a tyre
Outer diameter of a tyre
Method of measuring tyres
Tyre section width  specifications
Tyre outer diameter specifications 
HEADER
Definition of Reference Dimensions: Theoretical “Nominal” values that will be used for the specification in and 6.1.5
The Test procedure
Acceptance criteria of the measured value (6.1.3) vs Maximum/Minimum values

3. R30 Practical Example 215/40R16
6. REQUIREMENTS
6.1. Dimensions of tyres
Section width of a tyre
Outer diameter of a tyre
Method of measuring tyres
Tyre section width  specifications
Tyre outer diameter specifications 
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S = S1 + K(A-A1), = * ( *215)=213 mm
Overall Width Measured 213mm
OW <= 1.04 * S = 222mm <= 222 Ok

4. Tyre GTR Passenger car tyre dimensions Approach
3.5. Physical dimensions of passenger car tyres
Section width of a tyre
Outer diameter of tyre
Physical dimensions measurement method
Physical dimension requirements
Overall width
Outer diameter
HEADER
Definition of Reference Dimensions: Theoretical “Nominal” values that will be used for the specification in /
The Test procedure
Acceptance criteria of the measured value (3.5.3/3.5.4) vs Maximum/Minimum values

5. 3.18.5.3. sizes listed in tables D from annex 6 Including TWI
Definition of
Reference Dimensions:
Proposed Structure for the Physical Dimension requirements in the GTR # 16
3.18. Physical dimensions of LT/C tyres
Physical dimensions for metric sizes (excluding all sizes listed in Annex 6)
Section width of a tyre
Outer diameter of a tyre
Physical dimension for high flotation sizes (excluding all sizes listed in Annex 6)
Section width of a tyre
Outer diameter of a tyre
Physical dimension for sizes listed in annex 6
“the section and the outer diameter width shall be deemed to be that given opposite the tyre designation in those tables”
Physical dimensions measurement method
Physical dimension requirements
Metric sizes and sizes listed in tables A, B and C of Annex 6.
Overall width
Outer diameter
High flotation sizes (excluding sizes listed in table E of the Annex 6)
Overall width
Outer Diameter
sizes listed in tables D from annex 6
Overall width
Outer Diameter
sizes listed in tables E from annex 6
Overall width
Outer Diameter
HEADER
Including TWI
The Test procedure
Metric and Annex 6/ A,B, C grouped
because same tolerances
Acceptance criteria

6. Additional points
Open question from USTMA: Do we also need any adjustments in if measuring rim width code isn’t used?
Footnotes to be updated upon adoption of the text