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When tire tread depth is measured on a Pirelli Pzero 265/35 ZR20 which has 4 circumferential grooves, is the outside groove which has no tread wear indicator considered to be part of the measurement? Said another way-----Do you only consider the 3 grooves

  • 2016
  • Boxster S
Mileage: 
5 000
Wheels and Tires
Hillsborough, 
North Carolina

When tire tread depth is measured on a Pirelli Pzero 265/35 ZR20 which has 4 circumferential grooves, is the outside groove which has no tread wear indicator considered to be part of the measurement? Said another way-----Do you only consider the 3 grooves with wear indicators and if the wear on any of those 3 is under 4mm (the CPO standard), does the tire need to be replaced?

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