Document WT04 02 TYRE INDUSTRY WORK PLAN PROPOSAL

Document: WT-04 -02 TYRE INDUSTRY WORK PLAN PROPOSAL IWG WGWT October 18 th

AGENDA ü Aims of the Tests campaign ü Principles ü How to move forward

AIMS OF THE TESTS CAMPAIGN ü Assumptions : ANALITICAL TEST PLAN (limited number of tests sites (1 or 2) • • Worn Tyre preparation based on Tyre Industry proposed method Wet grip method based on improved method for new tyres Both Trailer and Vehicle test method to be assessed Both new and worn SRTT need to be tetsted (both are candidates as a future reference tyre) ü Some technical issues, specific to the worn tyre testing, need an assessment • Roughness: To confirm whether roughness has an impact or not on the Wet grip index performance and propose a maximum value • Worn profile: to check the influence of the worn profile variation by the current buffing method on the Wet Grip index dispersion • Natural versus buffed worn tyre: to validate the assumption that ageing can be neglected in the preparation method (Normal and 3 PMSF tyres). • New worn SRTT + waterdepth: 1. to check the dispersion linked to the tolerance of both buffing method (tread depth) and waterdepth range. 2. To check the worn SRTT brings in terms of dispersion • Tyres peculiarities: to study the behavior of the following peculiar tyres: legal race, All Terrain tyres, Ice tyres and to assess whether specific thresholds have to be considered.

GLOBAL SCREENING (involving all tests sites) AIMS OF THE TESTS CAMPAIGN ü Does the proposed method work for the worn tyre testing? Is the tests campaign representing the current market ? • Relevance of the test parameter ranges of the « new » method for the worn tyre method • Relevance of the WGI formulas/coefficients of the « new » method for the worn tyre • Test dispersion evaluation • Characterization of the worn tyre market performance • Decision on the threshold(s)

PRINCIPLE : SEVERAL ANALYTICAL TEST PLANS + A GLOBAL SCREENING TEST CAMPAIGN Worn profile GLOBAL Screening Roughness (involving all tests sites) Natural vs buffed (Ageing) SRTT New/Worn + water depth ANALITICAL TESTS PLAN (limited number of tests sites (1 or 2) Tread depth

PRINCIPLE : SEVERAL ANALYTICAL TEST PLANS + A GLOBAL SCREENING ROUND ROBIN TEST Tread depth lan p PLE l test M EXA lytica a An Worn profile GLOBAL screening Note: to check whether the proposed limit 20 um is valid also for SRTT. Advise to measure every 10 blocks the roughness and tread depth of the (worn) SRTT evolution Roughness Natural vs buffed (Ageing) SRTT New/Worn + water depth Candidate tyres : 2 Tread depth levels : 1 Worn profiles : 1 Surf. Roughnesses : 2 Ageing modes : 1 Ref. Tyre : Buffed : 1 New : 1 Ground friction lev. : 1 Ground Temp. lev. : 1 Water depth levels : 1 Number of sites : 1 % of candidates/site : 100% Statistical repetition : 4

PRINCIPLE : SEVERAL ANALYTICAL TEST PLANS + A GLOBAL SCREENING ROUND ROBIN TEST Trailer/Vehicl e Tread depth PLE M g EXA enin e Scr es r y t al rm o N Worn profile GLOBAL screening Roughness Ageing SRTT New/Worn Candidate tyres : 40/20 Tread depth levels : 1 Worn profiles : 1 Surf. Roughnesses : 1 Ageing modes : 1 Ref. Tyre : Buffed : 1 New : 1 Ground friction lev. : 1 Ground Temp. lev. : 1 Water depth levels : 1 Number of sites : 8/4 % of candidates/site : 50%/100% Statistical repetition : 1

CANDIDATE TIRES Screening • This objective implies to test a large range of tyres : • Normal: 40 candidates (trailer) and 20 candidates (vehicle) 4 grades (A: 5 tyres, B: 13 tyres, C: 18 tyres, E: 4 tyres), 6 tyre sizes (subdividing of sizes in terms of wet grip performance ), Premium (x%) , Medium (y%) , Budget (z%) from Lizeo database. • M+S: 7 candidates (trailer) and 3 candidates (vehicle) • 3 PMSF: 16 candidates (trailer) and 8 candidates (vehicle) Classe % A >= 155 9% B 140 - 154 29% C 125 - 139 49% D E 110 - 124 13% F <= 109 0%

NUMBER OF SITES • Number of participants to be confirmed: • EU Manufacturers : MI, BS, CO, GY, PI, NOK, … • Test centers : IDIADA, TUV, UTAC, … • Asia : JATMA, CATARC, …. èThis diversity would ensure a representative screening of test conditions èDeadline for participation confirmation by End November • NB : each participant to confirm the feasibility of trailer and/or vehicle test. Example : 8 potential sites for trailer , 6 for vehicle

ORGANIZATION / LOGISTICS • TYRES • MI provides SRTTs (depends on the number ) • Each internal candidate tyre is provided to all participants by each manufacturer • Other candidates tyres have to be bought • TYRE PREPARATION (BUFFING) • Each participant is responsible for preparation • Necessity to reach representativity of various preparation protocols • Additional Buffing capacities if needed • TO BE ADRESSED LATER : SHARING OF RESULTS • Dataset format and storage …

ASSUMPTIONS FOR THE TEST TIMING AND COST

GLOBAL OVERVIEW Assuming 11 participation sites Screening 3 PMSF Screening M+S Only Screening Normal tyres Roughness Worn Profiles Natural vs buffed worn tyre New worn SRTT + waterdepth Tyre Peculiarities Total trailer trailer vehicle Number of sites 8 4 8 3 8 4 1 1 2 2 1 Number of blocs / site 4 4 2 2 10 10 14 12 8 36 12 Number of test days / site 2 2 1 1 5 5 7 6 4 18 6 Total number of SRTT buffed 8 16 8 12 8 16 1 1 2 4 1 77 Total number of SRTT new 8 16 8 12 8 16 1 1 2 4 1 77 Total number of candidates 16 8 7 3 40 20 2 2 4 6 6 Total number of candidate tires 64 128 32 36 160 320 4 6 8 18 6 782 cost of tires 12 480 € 24 960 € 8 640 € 11 520 € 24 000 € 48 000 € 1 080 € 1 320 € 2 160 € 4 560 € 1 320 € 140 040 € cost of buffing 18 000 € 36 000 € 10 000 € 12 000 € 42 000 € 84 000 € 1 250 € 1 750 € 2 500 € 5 500 € 1 750 € 214 750 € cost of test 64 000 € 32 000 € 12 000 € 160 000 € 80 000 € 16 000 € 24 000 € 32 000 € 144 000 € 24 000 € 620 000 € 94 480 € 92 960 € 50 640 € 35 520 € 226 000 € 212 000 € 18 330 € 27 070 € 36 660 € 154 060 € 27 070 € total Screening work trailer vehicle Analytical work 974 790 €

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APPENDIX (1) Example of tyre selection: Screening V 2 - Test plan Size Type Label Tier Brand Trailer Vehicle 175/65 R 14 Summer C Premium GY x x 175/65 R 14 Summer B Budget T 3#1 x x 175/65 R 14 Summer C Budget T 3#4 x 175/65 R 14 M+S B Budget T 3#5 x 175/65 R 14 3 PMSF C Mid T 2#1 x x 175/65 R 14 3 PMSF B Budget T 3#7 x 195/65 R 15 Summer B Premium CON x x 195/65 R 15 Summer A Premium HK x 195/65 R 15 Summer A Mid T 2#3 x x 195/65 R 15 Summer C Mid T 2#5 x x 195/65 R 15 Summer E Mid T 2#4 x 195/65 R 15 Summer B Budget T 3#1 x x 195/65 R 15 Summer C Budget T 3#4 x x 195/65 R 15 Summer C Budget T 3#6 x x 195/65 R 15 Summer C Budget T 3#8 x 195/65 R 15 M+S B Budget T 3#10 x 195/65 R 15 M+S C Budget T 3#11 x 195/65 R 15 M+S C Budget T 3#5 x 195/65 R 15 3 PMSF C Budget T 3#7 x x 195/65 R 15 3 PMSF E Premium NOK x x 195/65 R 15 3 PMSF B Mid T 2#6 x x 205/55 R 16 Summer A Premium MI x x 205/55 R 16 Summer B Premium BS x 205/55 R 16 Summer C Premium GY x 205/55 R 16 Summer C Premium HK x x 205/55 R 16 Summer E Premium PI x x

APPENDIX (2) Example of tyre selection: w Ne