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HELP!!! Tyre Load and Speed Rating

fergysteven Feb 24, 2009

  1. fergysteven

    fergysteven New Member

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    I have a Audi A4 (B5) its a 1.8 se 1997 model but right on the change so it has some later stuff and some earlier stuff which can be a bit of a pain anyway i have just bought some 18" RS4 Replica alloys and i want to know what is the correct load and speed rating i have seen all sorts 88w 92w 94w and v's.

    Thanks Steven:wtf:
     
  2. Siena

    Siena Active Member

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    Hi Steven, and welcome aboard.

    You may want to shoot a PM to Aragorn on here, he's very knowledgeable about such issues.
     
  3. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    Well i'll post here to keep it on the forum so its searchable!

    Theres two parts to the number you posted, the two digit code and the letter.

    the two digit code gives you the weight the tyre can carry, and the letter is the speed the tyre is rated to.

    To deal with the speed first:

    V = 149MPH
    W = 168MPH
    Y = 186MPH
    Z = "150+"MPH

    So as you can see, as long as its V or higher your fine as far as the speed rating goes.

    For load index you need to check your maximum permissable axle weights off the vin plate under the bonnet.

    The number (ie 88) translates to a weight, you can see the table of weights here:

    http://www.pneus-online.co.uk/public/static_popup/popup_indice_charge.php

    So if for instance the axle weight is 1200kgs, your tyres need to be able to support 600kgs each, and therefore the load index as an absolute minimum would be 90. Most manufacturers add a 10% margin to the rating, so they'd choose a rating that would handle 660kg, which means they'd pick 94.

    I think most A4's are fitted with 91's from the factory, although some of the heavier cars like S4 Avants might need 94's

    Check the vin plate, and if your not sure post the numbers up and i'll tell you what you need.
     
  4. i always wondered about the z/v dual rating. why is there crossover?
     

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