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offsets

Discussion in 'A4/S4 forum(B5 Chassis)' started by imported_kris_tdi, Oct 17, 2005.

  1. imported_kris_tdi
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    imported_kris_tdi Guest

    what offset 18" or 17" wheels does the a4 use?
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  2. Soupie69uk
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    Soupie69uk Owner

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    Mine are ET35 but they are 19" think 17" are ET 45 and 18" need to be ET35

    Cheers
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  3. imported_kris_tdi
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    imported_kris_tdi Guest

    cheers, i was getting a bit confused as different places say different things.

    now the decision, do i get 17's or 18's ?????

    im swaying towards 17" rs4's at the mo. i want whatever i get to look like it came on the car, dont want it to stand out to much (although its decked), just update the looks
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  4. Soupie69uk
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    Soupie69uk Owner

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    Na mate get 18s you will regret it if you dont.

    Look at the new S-line A4's, the 18s dont look that big on them.
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  5. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    Go for 18's m8, theye will be the same rolling radius as the 16's you have, At least thats what i want, nay NEED to do,lol
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  6. Olly__K
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    Olly__K Guest

    as far as im aware, and please correct me if i'm wrong, but doesnt the offset stay the same no matter what size of wheel ?
    the offset is how the far wheel sticks out/sits in from the arch.
    The tyre profile is the thing that changes, so 45 for 17's, 40 for 18's 35 for 19's, to keep the rolling circumference the same
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  7. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    Thats right, its just generally the width increases too, this can cause the tyre/wheel to foul the suspension or arch, therefore sometimes it is necessary to change to ofset to space the wheel accordingly.
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  8. imported_VaulterTim
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    imported_VaulterTim Guest

    This is all true but the profile should only change in relation to the tyre width in order to keep the same rolling radius since it is a percentage of the width itself.

    For instance, my car had 225 x 45 x 17's on it as standard which gives a rolling radius of 63.43cm

    45% of 225mm = 10.25cm
    x2 [because there are two sidewalls] = 20.25cm
    + 17" [43.18 (17x2.54)]

    Total = 63.43cm


    For the 225 x 40 x 18's that I now have on there...

    40% of 225 = 9
    x2 = 18
    +18" [45.72 (18x2.54)]

    Total = 63.72cm


    So as you can see the radius difference is within 3mm and tolerance is easily within that of the difference between a new and worn tyre.

    /ubbthreads/images/graemlins/smile.gif

    T
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  9. jonnya
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    jonnya Member

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    Offset is actually the distance between the back of the mounting hub and the centre line
    of the wheel. Wide wheels can require a change in offset to avoid fouling.
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  10. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    Definately go with 18's. I made the mistake of getting 17's at first and they look too small, had to wait a couple of years before I could justify getting 18's
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