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Different wheel size?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by BakPak, Jan 30, 2014.

  1. BakPak
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    BakPak No Gear

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    [Jan 30, 2014]
    Hey everyone, got a question about fitting some different wheels on my standard 1.9 130 fwd. I've seen some 18's for sale from a 1998 A8, the tyres are 245/45/18 and the wheel size is 5*112 8J offset ET48. Will they fit? Thanks.
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  3. S4_dan
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    S4_dan Fire up the Quattro!

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    [Jan 30, 2014]
    In a nut shell, yes they will fit. They 'May' rub but some spacers would sort that.
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  4. BakPak
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    BakPak No Gear

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    [Jan 30, 2014]
    Cheers dude.
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  5. Jimmy TDI
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    Jimmy TDI Pro Tinkerer

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    [Jan 30, 2014]
    Also the tyres are too big so your speedo will be out slightly.

    THIS is a good site to use to check wheel fitment.
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  6. BakPak
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    BakPak No Gear

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    [Jan 30, 2014]
    Who sells wheel spacers and presumably longer wheel studs? Thanks.
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  7. desertstorm
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    desertstorm Well-Known Member

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  8. Gazwould
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    Gazwould Active Member

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    [Jan 30, 2014]
    Fronts will be in danger of rubbing suspension so spacers.

    At 245/45 /18 they are technically oversize and will raise the chassis a little, even correct up sizing has this effect due to tyre sizes not being precise from make to make so these calculators can be thrown out of the window.

    I recently went from 205 55 16 to a technically oversize 235 45 17 and measured before and after mph with gps and the later is as near as spot on accurate.

    It's well known a stock car always under reads.
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  9. BakPak
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    BakPak No Gear

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    [Jan 31, 2014]
    Thanks for the info guys. If I had 225*40*18 tyres instead would they still need spacers? A mate of mine has a b5 2.5tdi quattro with 18's from a TT with 225*40*18 tyres and he has no spacers fitted with no problems.
    If I do buy these wheels I could fit them, take some measurements and go from there, or should I buy some 15mm spacers front and rear to avoid messing about!

    Thanks, Mark.
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  10. Gazwould
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    Gazwould Active Member

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    [Jan 31, 2014]
    It's all down to the offset ET number.

    The higher the number the closer it tucks in and closer to the suspension.
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  11. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Jan 31, 2014]
    If you're going to the effort of changing the tyres, 235/40's are the standard 18" tyre size on our cars.
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  12. Mike.M
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    Mike.M Well-Known Member

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    [Jan 31, 2014]
    ET is just as important as the tyre size. Standard 18s are 235/40/18 and 17s are 235/45/17.

    Aim for an ET35 and you should be fine
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  13. Mike.M
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    Mike.M Well-Known Member

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    [Jan 31, 2014]
    Same time James LOL
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  14. BakPak
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    BakPak No Gear

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    [Jan 31, 2014]
    Thanks Mike, is the ET number a measurement in mm or inches? Do you think I should avoid the A8 alloys I mentioned with an ET48 offset? I don't have an issue with fitting spacers, so long as they correct any problems. The slight difference in tyre size should be ok, shouldn't it?? By the way your A4 is stunning dude!

    Thanks, Mark.
    Last edited: Jan 31, 2014
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  15. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Jan 31, 2014]
    There is nothing wrong with the A8 wheels if you like them, it just means you'll need to pay extra for spacers. A4's run ET43/45 as standard on an 8J rim, and most people will space them to ET35 give or take. There are plenty of wheels about which don't require spacers though. If you like them and the price is right don't let the need for spacers put you off.

    ET is the distance in mm from the wheel centre to the hub face.

    Wheel offset information.
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  16. BakPak
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    BakPak No Gear

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    [Jan 31, 2014]
    Thanks James, so if I fit 15mm spacers front and rear that should be ok?
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  17. Mike.M
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    Mike.M Well-Known Member

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    [Jan 31, 2014]
    Yes but make sure they are hubcentric ones with longer bolts too
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  18. bobsyouruncle
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    bobsyouruncle New Member

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    [May 31, 2014]
    I don't think it warrants starting a new thread, but I'm looking clarity on a similar issue.

    I have the original 17" sport wheels that are 7.5J et45. I've bought a set of 19" RS4 style rims that are 8.5J et48.

    I trial fitted the rim and it's MUCH closer on the inside. It seems the extra inch also plays a part in bringing the wheel closer to the inside as well as the extra 3 on the ET.

    I clearly need spacers, so what size can I get away with? I'd like to be flush or a little short of flush with the arch.
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  19. Mike.M
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    Mike.M Well-Known Member

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    [Jun 1, 2014]
    A 15mm hubcentric spacer will bring the wheel to an ET33 which will sit flush with the arch
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