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Tyre size advice please

Discussion in 'A3/S3 Forum (8L Chassis)' started by Nogmeister, Aug 13, 2012.

  1. Nogmeister
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    Nogmeister Member

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    [Aug 13, 2012]
    Righto, im looking at some 18's to replace the 17" Avus 3's. Looking at 8.5" all round, 9.5" all round, or 8.5" fronts and 9.5" rears.

    Can someone advise what size tyres to get for these combos? As the tyre price will be a factor in the decision.

    Cheers
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  3. ruffrida
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    ruffrida Well-Known Member

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    [Aug 13, 2012]
    I am running 235 / 40 / 18's on mine (see my pics) and it is sounds, no hard bounce, but just enough tyre roll.

    Decent new about £75 each

    Budget new about £55 each
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  4. Nogmeister
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    Nogmeister Member

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    [Aug 13, 2012]
    Cheers dude, what rim width is yours?
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  5. jcs356
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    jcs356 Brum brum

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    [Aug 13, 2012]
    To maintain rolling circumference 225/40/18's are closer to the 225/45/17's you'll have previously had. They are also a more popular size hence tyres are cheaper due to the demand.
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  6. Nogmeister
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    Nogmeister Member

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    [Aug 13, 2012]
    Fair one, so 225/40's on a 8.5" seems ok, but on a 9.5" rim would be stretched a bit? Any issues with that?

    I'd LIKE to go 9.5" all round, so maybe a bit of stretch will be needed...
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  7. ruffrida
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    ruffrida Well-Known Member

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    [Aug 14, 2012]
    Yeh you would have to go for the V-dub look with 9.5's, mine are 8.5 and look sweet.

    The rolling circumference would only matter if you went to 225/35/18 or a 225/40/18, the 35 giving a lower and the 40 the higher. The width of the tyre has nothing to do with it, its all about your profile, 35, 40, 45.

    I used to have 35's but the ride was to harsh on me rims and the speedo was out, put the 40's on and the speedo is nearly perfect, according to gps anyway
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  8. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Aug 14, 2012]
    The profile is a percentage of the width, so changing the width will affect the rolling circumference.
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  9. ruffrida
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    ruffrida Well-Known Member

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    [Aug 14, 2012]
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  10. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Aug 14, 2012]
    yep, but a 195/40r18 is fairly different to a 255/40r18

    The RS4 for instance runs 255/35R18's, which are the same rolling circumference as a 225/40r18.
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