I need some help on my 550 | FerrariChat
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I need some help on my 550

Discussion in '456/550/575' started by Bart, May 19, 2004.

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  1. Bart

    Bart Formula 3

    Nov 1, 2003
    1,522
    Orange County, Calif
    Full Name:
    Bart
    #1 Bart, May 19, 2004
    I just got a set of tires for my 550. I went to the dealer for them. My mechanic who has my car right now called me to say the front tires are the wrong size.

    The question is what is the correct size for the front tires on a 550?

    2.55 45 ZR18 or 2.35 45 ZR18
     
  2. 550

    550 Rookie

    Sep 19, 2003
    46
    #2 550, May 19, 2004
    what brand of tire do you have?
     
  3. Doody

    Doody F1 Veteran

    Nov 16, 2001
    6,099
    MA USA
    Full Name:
    Mr. Doody
    #3 Doody, May 19, 2004
    the stock tires are:

    FRONT: 255/40 ZR 18 on 8.5J x 18 wheels
    REAR: 295/35 ZR 18 on 10.5J x 18 wheels

    doody.
     
  4. maranelloman

    maranelloman Guest

    #4 maranelloman, May 19, 2004
    Bart, Michelin provided OEM tires in the Pilot SX class for the 550 with a 235 front width. All th eother OEM tire suppliers provided 255's. If I were you, make them change to a modern 255 tire.
     
  5. teachdna

    teachdna Formula Junior

    Sep 1, 2001
    374
    Cincinnati
    Full Name:
    Jeffrey Robbins
    #5 teachdna, May 19, 2004
    Just looked at mine, which are stock wheels and tires installed by the dealer. My fronts are 235/45/ZR18, Michelin Pilot SX. Could be the stock wheels can take 235-255?
     
  6. Doody

    Doody F1 Veteran

    Nov 16, 2001
    6,099
    MA USA
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    Mr. Doody
    #6 Doody, May 19, 2004
    how weird that the michelins are 235s. that's how it's spec'd in the book too (cf.).

    doody.
     
  7. teachdna

    teachdna Formula Junior

    Sep 1, 2001
    374
    Cincinnati
    Full Name:
    Jeffrey Robbins
    #7 teachdna, May 19, 2004
    So help me out here: what differences in handling, crispness of turn-in, etc are we going to see between a 235 versus 255?
     
  8. Bart

    Bart Formula 3

    Nov 1, 2003
    1,522
    Orange County, Calif
    Full Name:
    Bart
    #8 Bart, May 21, 2004
    The plate on the door jam says 2.35 not 2.55.

    Which one is stock?
     
  9. ferrarifixer

    ferrarifixer F1 Veteran
    BANNED

    Jul 22, 2003
    8,520
    Melbourne
    Full Name:
    Phil Hughes
    #9 ferrarifixer, May 21, 2004
    Different companies spec their sizes differently. Some use the width to mean the actual tread width, and some use it to define the carcass size.

    The overall circumferance is the important one, and the sizes in the handbook are all the same in real terms.

    If you have 255 45 they are too tall. You need 255 40 or 235 45.
     
  10. speedball

    speedball Formula Junior

    Mar 29, 2004
    268
    Pasadena Area
    Full Name:
    Scot Anderson
    #10 speedball, May 22, 2004
    My 2000 550 came with Bridgestone S 02's in the 255/40/18 front size ..... haven't tried other tires on mine .... these work great and look good.
     
  11. Bart

    Bart Formula 3

    Nov 1, 2003
    1,522
    Orange County, Calif
    Full Name:
    Bart
    #11 Bart, May 24, 2004
    I took my 550 to Ferrari of Orange County today. Within three hours they had change both front tires for smaller ones. No mess, no hassle.

    Thanks!
     
  12. AEHaas

    AEHaas Formula 3

    May 9, 2003
    1,465
    Osprey, Florida
    Full Name:
    Ali E. Haas
    #12 AEHaas, May 24, 2004
    Please note
    The Michelin is a 235/45 ZR 18
    The others are a 255/40 ZR 18

    One is a 45 and the other a 40 aspect ratio. This keeps the overall diameter the same. The manufacturer does not matter, only the size.

    For this car the wider tire with the shorter aspect ratio is better for handling.

    aehaas
     
  13. shelbee

    shelbee Guest

    #13 shelbee, May 24, 2004
    The Michelin is 235 only apply to MXX3 but for Pilot Sports are 255/40/18
     

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