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What tires are you running on 12in+ rears?

Discussion in '456/550/575' started by Auraraptor, Aug 1, 2020.

  1. Auraraptor

    Auraraptor F1 World Champ
    Owner Lifetime Rossa

    Sep 25, 2002
    11,307
    MO
    Looking into the feasibly of using a 12.5in rear in 2020, the tire options are extremely limited. I also don't want to get too far off the rolling diameter or the TCS will start having issues.

    Historically, people used 355/25-19, but these tires are NLA, with only used tires with "vintage" date codes remaining. No 355, 345, 335, or 325/25-19 are available new per tirerack (as of 8/2020)

    Some digging around shows you can still get a 325/30-19, but recall factory is a 305/30-19. I am not sure if the TCS will like the added sidewall? It appears 325 are also rated for up to 12, not 12.5in wheels, at least for the michellin and bridgestone offerings.

    What are people running (if anyone is even still running anything this wide)?
     
  2. tazandjan

    tazandjan Three Time F1 World Champ
    Owner Lifetime Rossa

    Jul 19, 2008
    32,007
    Clarksville, Tennessee
    Full Name:
    Terry H Phillips
    For the Novitec NF2s (9" F, 12.5" R), when Pirelli stopped making the 355/25 19s, owners went to MPSS tires in 345/30 19. These have not caused any ABS issues on 456s or Maranellos. Standard 255/35 19s worked in the front. The MPSS is almost as good as the PS4S and it is still available. They are much better tires than the Pirellis on my NF2s were.
     
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  3. mathewr

    mathewr Formula 3
    Rossa Subscribed Classified Subscribed

    And I have the set of NF2 ready to go for you! Just add the tires.
     
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  4. white out

    white out Formula Junior
    Silver Subscribed

    Mar 3, 2010
    822
    SoCal
    Full Name:
    Nick
    You should be good with 325 on 12.5. I ran Toyo R888 315 on a 12" wheel and the sidewall still had bulge
     
  5. tazandjan

    tazandjan Three Time F1 World Champ
    Owner Lifetime Rossa

    Jul 19, 2008
    32,007
    Clarksville, Tennessee
    Full Name:
    Terry H Phillips
    I bought a set of NF1s to try and fit them to my 575M (impossible without major cost). They had 325s on them in the rear and the sidewalls looked really stretched on the 12.5" wheels.
     

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