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Thread: Tyre speed rating explained

  1. #1
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    Default Tyre speed rating explained

    Click here for speed ratings and codes


    use this site to explain the speed rating of your tyre , or tyres you may want to buy,

    the code is also sometimes in the tyre description,

    eg, 225/45/ZR17.............Z = speed rating and the R = radius of wheel

    or sometimes its 225/45/R17 and the Z will be else where on the tyre

    the 225 in this case is the actual width of the tyre from inner sidewall to outer sidewall,

    the 45 is a percentage of the width ( 225 ) making up the depth of the tyre from the rim on the wheel to the outer diamiter of the tyre

    so a 225/45/ZR17 is 225mm wide, with 101.25mm depth on a 17 inch wheel with a speed rating of over 150 mph ( 180 mph )

    just in case anyone is interested

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    Ex-Staff Full Member big phil's Avatar
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    Mmmm think they've changed the rating letters now ...

    < 160 mph --- is a W rating
    <



    Watch the truck pull on youtube --http://www.youtube.com/watch?v=zjGfVxXov1E

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    Nice

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    Regular Member solorider's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9 120bhp

    Year : 2004

    Mileage : 139,600

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    another thing to point out is just because your car has a higher speed rating than listed dont be tempted to use a lower speed rating as there are other factors also included like the acceleration,weight etc.

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by big phil View Post
    Mmmm think they've changed the rating letters now ...
    160 mph --- is a W rating
    Where did you get 160mph from?
    All these old style letters of V and above are to be phased out, and replaced by VR and ZR

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