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599GTO wheels on GTB

Discussion in 'Technical Q&A' started by Rotti, Jan 3, 2017.

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  1. Rotti

    Rotti Rookie

    Feb 27, 2013
    20
    Canberra
    Full Name:
    Alex
    #1 Rotti, Jan 3, 2017
    Last edited by a moderator: Sep 7, 2017
    I have put GTO rims on my 2008 GTB and they look sensational (pic attached from recent road trip). However my dealer will not put GTO tyres on because they say the extra rolling width of the tyres will affect the electronic diff and potentially cause inadvertent activation of the e diff at certain speeds. The GTB tyres on the GTO rims look terrible because of the rims stick out due to being wider than the tyres. Has anyone got experience with GTO rims on the standard GTB and is the e diff thing really an issue. I wouldn't want traction control to kick in inappropriately at 200kph! Thank you in advance
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  2. greyboxer

    greyboxer F1 World Champ

    Dec 8, 2004
    12,637
    South East
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    Jimmie
    #2 greyboxer, Jan 3, 2017
  3. Caeruleus11

    Caeruleus11 F1 World Champ
    Rossa Subscribed

    Jun 11, 2013
    11,474
    #3 Caeruleus11, Jan 3, 2017
    I had the GTO MPSS (315 v 305) on the rear of my 599 but with the original challenge style wheels and I never had a problem. And I drove that car pretty hard. Btw- your car looks great!
     
  4. EP328

    EP328 Formula Junior
    Silver Subscribed

    Sep 3, 2008
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    Northern California
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    Ed
    #4 EP328, Jan 3, 2017
    I am running with the MPSS 315s on challenge wheels on my '09 GTB. In "wet" mode the traction control intervenes on slow ( <25mph) left hand turns. No problems in sport. Dealer said problem is because the ratios are slightly off because of larger rear tire.
     
  5. kylec

    kylec F1 Rookie
    Silver Subscribed

    Jun 9, 2005
    3,666
    Orlando
    #5 kylec, Jan 3, 2017
    Could it be reprogrammed/reflashed to the GTO specifications?
     
  6. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
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    Clarksville, Tennessee
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    Terry H Phillips
    #6 tazandjan, Jan 3, 2017
    See reply in other forum.
     
  7. Rotti

    Rotti Rookie

    Feb 27, 2013
    20
    Canberra
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    Alex
    #7 Rotti, Jan 3, 2017
    Thank you! I had them repainted to the matt silver colour of the original rims. Car in this pic is covered in dirt from the road trip! Thanks for the feedback re tyres.
     
  8. AZshadetree

    AZshadetree Rookie

    Nov 6, 2016
    14
    AZ
    #8 AZshadetree, Jan 3, 2017
    599 has a conventional limited slip differential, no e-diff at all. Not even GTO...
     
  9. cmparrenzo

    cmparrenzo F1 Rookie

    Mar 3, 2002
    2,686
    Kansas
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    Chris Parr
    #9 cmparrenzo, Jan 4, 2017
    Last edited by a moderator: Sep 7, 2017
    I have GTO wheels on my GTB, only use GTO spec tires when using these wheels.

    The GTB tires are too narrow. I have put over 20,000 miles on my GTB with GTO wheels and tires with no issues.

    It is not the size of the tire that is the issue, it is the ratio between the front and rear tire sizes that is critical, if you change that ratio it will cause issues with the abs, in this case the ratio between the stock GTB tires and the GTO tires fall within the acceptable ratios for the abs system.

    IMHO and experience. the GTO spec tires will not cause you to have an over steer issue as your dealer told you, the increase in tire width was to address the inherent under steer issue with GTB's.

    Buy the correct GTO tires from Tire Rack and have a reputable shop install them ( I have had two sets of GTO Michelins but I current have Pirelli's and like them better, I am on my 3rd set of tires).

    Enjoy your car and put the correct tires on those rims!
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  10. Rotti

    Rotti Rookie

    Feb 27, 2013
    20
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    Alex
    #10 Rotti, Jan 4, 2017
    Perfect! thanks dude, great to hear it s all OK. Your beast looks awesome too!
     
  11. tcw

    tcw Karting

    Mar 11, 2009
    110
    #11 tcw, Jan 4, 2017
    I had some aftermarket 21" and 22" Forgiato rims on my car when I bought it and there were no apparent issues. Since have changed to 20" Challenge wheels for cosmetic reasons.
     

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