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Can i replace ZR18 tyres with r18 tyres?

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by DJM1982, Feb 21, 2011.

  1. DJM1982
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    DJM1982 Member

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    [Feb 21, 2011]
    As above.
    I have been searching the internet for information but alot of it is very confusing.

    I currently have mitchelin pilots sport 2's on my audi A4 (234/40 ZR18 (95Y)) but looking at replacing them with Uniroyal Rainsport 2's (235/40 R18 (95Y)), because i need 4 new tyres and cannot afford the michenlins this time round.

    Can i do this?
    Has anyone else done this?
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  3. rowdyboy
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    rowdyboy Member

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    [Feb 21, 2011]
    Last edited: Feb 21, 2011
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  4. DJM1982
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    DJM1982 Member

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    [Feb 21, 2011]
    From what i can gather from lots of reading, ZR means that the tyre has been approved of doing over 149mph but doesn't specify by how much, thats where the speed rating comes in. So if i am replacing Y rated tyre with another Y rated tyre, regardless of whether it has ZR on it should be ok? But still uncertain.

    I have tried looking in my user manual and the service book as to where i can find the recommended manufacturers tyre specs but i can't find it anywhere?
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  5. rowdyboy
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    rowdyboy Member

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    [Feb 21, 2011]
    Is the ZR after your wheel size, or before?
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  6. johnnythepie
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    johnnythepie Well-Known Member

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    [Feb 21, 2011]
    Yup.No probs.Absolutely safe.both up to speeds of 186mph
    check these guys out, ive used them several times before and are excellent
    Tyretraders search results

    Wish i had 18 s instead of 19 s, much more choice and cheaper!
    #5
  7. DJM1982
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    DJM1982 Member

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    [Feb 21, 2011]
    My tyres are 235/40 ZR18 (95Y), whereas the ones i'm looking at buying are 235/40 R18 (95Y). So before the wheel size
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  8. DJM1982
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    DJM1982 Member

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    [Feb 21, 2011]
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  9. rowdyboy
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    rowdyboy Member

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    [Feb 21, 2011]
    The ZR has nothing to do with the speed rating then, it's the "Y" after the size that denotes speed rating. As it shows on the diagram I posted, the R denotes "radial".
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  10. DJM1982
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    DJM1982 Member

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    [Feb 22, 2011]
    From what i have been reading, the ZR was using originally for Tyres capable of of over 149mph, but it never specified how much over and has cars became capable of sustained high speeds tyre manufacturer's started using W and Y rated to specify the actually speed rating of the tyre, so your right. It shouldn't actually means anything anymore.
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