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Does anybody know the difference between R and ZR when it comes to tyres?

Djl Jan 13, 2020

  1. Djl

    Djl Registered User

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    Unfortunately hit a massive pot hole last night and my front left tyre is now ruined.

    All 4 tyres are Michelin P-Zero 235/35 ZR19 91y R01.

    I’ve shopped around but it looks like the local fitters can only get R instead of ZR. Does anybody know the difference?

    From what I understand, 235/35 is width/diameter, 91Y is the speed rating, R01 is the type of fit (Audi Quattro) and 19 is the wheel size. A few sources say ZR is also a speed rating but I thought that’s what the 91Y was for.
     
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  3. Arcam

    Arcam Registered User

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    91Y is the load rating, ZR is the speed rating, do not use a R rated tyre.

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  4. Pinky1959

    Pinky1959 Registered User

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    Hope this helps
    Speed rating is identified as a part of the tire's sizing or service description. For tires having a maximum speed capability above 240 km/h (149 mph), a “ZR” may appear in the size designation. For tires having a maximum speed capability above 300 km/h (186 mph), a “ZR” must appear in the size designation.
     
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  5. Roxman87

    Roxman87 Registered User

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    Funny my 18 plate came with R19 not ZR all round
     
  6. Arcam

    Arcam Registered User

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    If you checked the tyre you would find a speed rating as well, it can depend on the tyre maker.

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  7. T-1000

    T-1000 Registered User

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    [​IMG]

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  8. rjb79

    rjb79 Registered User

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    Whats the difference between a standard PZero and a PZero with an RO2 marker apart from £20 a corner? Is it just an Audi tax or is the tyre actually different in anyway? Thanks
     
  9. T-1000

    T-1000 Registered User

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    Pirelli & Audi will tell you it’s been specifically designed for an quattro car.


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  10. MartayMcFly

    MartayMcFly Booooooost Gold Supporter VCDS Map User

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    This answer is why you should just google this stuff, and not rely on incorrect information from semi-informed forum members. 91 is the load rating (615kg) and Y is the speed rating (up to 186mph). Not a huge deal in this instance, maybe, but still incorrect.

    ZR used to mean something like "performance", and latterly meant ~149mph and over, but the speed rating is what to go by. And, for the record, R as a speed rating (ie a tyre marked 88R) is only rated to 106mph.
     
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  11. sve170

    sve170 Registered User

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    I often wonder why on many forums the same questions keep getting asked year after year especially when it comes to tyres.

    The RS3 comes with ZR rated tyres for a reason, it’s a performance car and requires a tyre that can perform at very high speeds such as 155 mph and above.
    Why would anyone owning one of these amazing motors even consider putting lower rated tyres on their car?

    Is it down to cost? Or they genuinely do not know what tyre to fit. I suspect it’s mainly down to cost. Us owners have spent in excess of £50,000 on their dream motor and go and put incorrect replacement tyres when required, the mind boggles.

    Just my opinion though!!!


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