Ferrari 308 wheel offset (ET) | FerrariChat
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Ferrari 308 wheel offset (ET)

Discussion in '308/328' started by BigOJS, May 19, 2011.

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  1. BigOJS

    BigOJS Rookie

    Apr 24, 2011
    22
    Finland
    Full Name:
    BigOJS
    #1 BigOJS, May 19, 2011
    My first Ferrari (308 GTS) will be shipped to me in next couple of weeks and I have bought bunch of spare parts already so that after major service I could enjoy my car already this summer.

    But... I am a bit concerned about wheels of the car. As far as I have understood it has 390mm wheels and here in Finland it is VERY hard to find such wheels. So... I would like to upgrade wheels and why not to upgrade it all the way to 17'' or even 18''. Bolt Pattern is 5x108 but I do not have slightest idea about what is offset of wheel (e.g. in case of 8'' wide wheel). Also width of center hole is not known.

    I hope that here are lot of 308 owners who can help me with these open questions.
    -Ossi
     
  2. greyboxer

    greyboxer F1 World Champ

    Dec 8, 2004
    12,622
    South East
    Full Name:
    Jimmie
    #2 greyboxer, May 19, 2011
    As advised last month

    For example http://ferrarichat.com/forum/showthread.php?t=8361

    There's also lots of threads about changing from TRX / 390mm wheels & tires
     
  3. BigOJS

    BigOJS Rookie

    Apr 24, 2011
    22
    Finland
    Full Name:
    BigOJS
    #3 BigOJS, May 19, 2011
    So if somebody is interested about 308 offset: ~11,5 ET front and back with 7 and 8 inch wide wheels.
    -O
     
  4. Owens84QV

    Owens84QV F1 Rookie

    Oct 2, 2001
    4,486
    Somewhere in NC
    Full Name:
    Greg
    #4 Owens84QV, May 19, 2011
    Stock non-metric wheels are 16. 17's might look OK, but I think 18's would be too big...you'd have to mount a pretty low profile tire to make it fit I would imagine.
     
  5. BigOJS

    BigOJS Rookie

    Apr 24, 2011
    22
    Finland
    Full Name:
    BigOJS
    #5 BigOJS, May 19, 2011
    as far as I have understood original tires are 205/55/16 front and 225/50/16 back. If this is correct basically it means that right 18'' wheel should be 225/35. Then diameter of new tires should be little smaller than original and I doubt that there is any rubbing if offset is right.
    -O
     
  6. tobi767

    tobi767 Rookie

    Sep 9, 2011
    28
    Marone, Lago d´Iseo
    Full Name:
    Tobi767
    #6 tobi767, May 22, 2012
    Hi everyone,

    I have a little offset issue as well. I managed to get the center parts for the compomotive TS rims, and as compomotive doesn´t produce the TS rims anymore I have to get the inner and outer rims from a different supplier.
    No big deal, as I found a supplier that produced for compomotive in the past - but my problem is basically not knowing what size to take... I figured in order to keep the GTO-style in mind, I think the outer rims are quite "small" and besides it looks the outer rims have the same dimension for the front and rear wheels.... So to keep it less cryptic, I know that for the front wheels, if I go for 1.5" outer, 5.0" inner rim I will get a total 7" rim in the front with an offset of +03... concerning the back, in order to have also the 1.5" outer rim, I have to go to a 6" inner rim to have a total 8" rim in the back.... and what I calculated was an Offset of -9.75 in the rear....
    I calculated the Offset in the rear by using the numbers of the front rims... outer rim and centre part leaves me with a distance of 91.9 mm (considering the Offset +03 in this combination)... using this for the rear rims - I come up with an offset of -9.75...

    Now question is, if I calculated it right, and if so, is this dimension in the back would still work?
    May be someone could give me some advice...
     
  7. st@ven

    st@ven F1 Rookie

    Aug 4, 2008
    3,295
    Netherlands
    Full Name:
    Steven
    #7 st@ven, May 22, 2012
    first, why stick to the original rim width? On my '87 ( non abs) 328 i have the Compomotive 16" TS in 8" at the front and 9" in the rear

    On my 308 have the same wheels, only in 17" in 8 in the front and 9,5 in the rear.

    1,5 outer at the rear will definately be to little to look good
     

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