Page tree
PROPOSAL
Work Plan - initial evaluation of proposed procedure to assess wet traction of worn tires
Tires
Tire SegmentSummerWinterSRTT 16"
HPUUHPBaseHPSUV4x4road legal racefor special testsControl
Tire Sizesmalllargesmallmediumlargesmalllargesmall large
195/65R15225/45R17225/45R17245/45R19295/30R20155/65R14205/55R16205/55R16245/45R19255/55R18255/55R18ground
4 rib5 rib5 rib5 rib5 rib5 ribblock40 um
PRIORITIES
Worn Tire Definitionworn tire surfacefield worn/agedXXX
ground + road break-inXX
ground 20 umXXX
ground 40 umXX
ageingnew, ground
field worn/aged
tread depthminXXXX
midXXXXXXXXXXXX
maxXXX
ground SRTT evolutionafter 50, 100, 150 repeatsX (freshly buffed)X
buffing process (speed)regular XXX
fast XX
shoulder radius - only in case of reduced tread depth at shoulderhighXX
midX
smallX
tread depth distr. within limitsCl wearXX
Sh wearX
Test procedureSRTT new or wornincluded in road friction and water depth evaluation below
Vehicle vs TrailerXXXXXX
road frictionminXSRTT NewX
maxXSRTT New
water depth0.5 mmXXXXSRTT NewX
1.0 mmXXXXSRTT New
1.5 mmXXXXSRTT New
road temperatureminXXX
maxXX
SL vs XLXXX
proposal to not evaluate
Combinationwater depth X tread depth XXXX tbdXXX
Notes:- X stands for 4 repeat tests per variable
- above proposal includes 85 single test items
- Trailer method to be used for all tests except for line "Vehicle vs Trailer"
- Colours of cells denote possible blocks of work.
- ETRTO experts to be allowed access to test facilities during completion of test plan.
- Round Robin test to perform Gage R & R study following the completion of above test plan.