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RS4 18in Wheels

Discussion in 'A4/S4 forum(B5 Chassis)' started by chesterdog, Dec 27, 2004.

  1. chesterdog
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    chesterdog Member

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    [Dec 27, 2004]
    I just bought some 18 inch RS4 rims for my 1998 A4 Quattro 2.8 with sumitomo tires. Does anyone have any experience with these rims/tires. I am also fitting new shocks and springs and wanted to hear any recomendations. I am considering the eibach pro system plus, but would like to hear opinions. Thanks.
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  3. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Dec 28, 2004]
    Are they OEM RS4's or replicas?
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  4. chesterdog
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    chesterdog Member

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    [Dec 28, 2004]
    They are built at the OEM factory, to oem specs and are tuy, dot, etc. aproved, but somehow they technically are not OEM wheels.
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  5. fallmonk
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    fallmonk Turbo Sport

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    [Dec 28, 2004]
    Did they fall of the back off a lorry lol???
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  6. chesterdog
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    chesterdog Member

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    [Dec 28, 2004]
    Not to my knowledge.
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  7. gc48067
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    gc48067 Member

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    [Dec 28, 2004]
    Check for dents - if they fell of the back of a lorry they are bound to have small flat marks on the rim. This does of course depend on the size of the lorry - if it was a small truck the denting may be harder to spot.

    Greg
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  8. chesterdog
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    chesterdog Member

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    [Dec 28, 2004]
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  9. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Dec 28, 2004]
    So they are replica's then. Simply referring to OE means nothing just that they are the manufacturer, the centre caps are not Audi originals either. Not too sure about Sumitomo tyres but they will fit an A4 no problem, but the tyre size is wrong. Should be 225/40/18 which is the closest rolling radius to the originals. 235's give you an error of 2%, whereas 225's = 0.8%.
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  10. chesterdog
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    chesterdog Member

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    [Dec 28, 2004]
    I thought that the 225, 235 refered to the width of the tire not the sidewall height, will additional width give me speedometer error? I looked at Tire rack and found this tech article, what do you think?
    P225/50R16 91S

    The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width. Because many people think of measurements in inches, the 225mm can be converted to inches by dividing the section width in millimeters by 25.4 (the number of millimeters per inch).


    225mm รท 25.4 = 8.86"



    Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.
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  11. chesterdog
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    chesterdog Member

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    [Dec 28, 2004]
    From the pictures, it looks like your car has aftermarket suspension. If so, what set up did you use and what would you recomend. I have been leening towards the Eibach Pro System. Thanks.
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  12. gc48067
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    gc48067 Member

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    [Dec 28, 2004]
    [ QUOTE ]
    afourquattro said:
    I thought that the 225, 235 refered to the width of the tire not the sidewall height, will additional width give me speedometer error? I looked at Tire rack and found this tech article, what do you think?
    P225/50R16 91S

    [/ QUOTE ]

    Right but the /50 bit references the % of the tyres width that is diameter above the rim size.

    Wheel size is 18 inch. 235/50 is 18 inch plus (235 x 50%) 117.5mm (4.6") total of 22.6" diameter. 235/40 is 18 inch plus (235 x 40%) 94mm (3.7") total of 21.7
    " diameter.

    Larger diameter means more road passes under the car per revolution so the speedo will further out with larger diameter tyres.


    Greg
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  13. chesterdog
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    chesterdog Member

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    [Dec 28, 2004]
    I bought 235/40's but they would still be taller than 225/40's. Thanks. Any opinions on suspension?
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  14. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Dec 29, 2004]
    235/40 means 235mm wide with a profile (sidewall height) of 40% of 235 i.e.94mm
    The closest to the original rolling radius (to keep the speedo, but more importantly the geering of the car correct) is 225/40 with a sidewall height of 90mm.
    Why oh why we still use mm's and inches to define the size of a tyre I'll never know.
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