Tire Pressure for P Zero Asymetrico | FerrariChat
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Tire Pressure for P Zero Asymetrico

Discussion in 'Technical Q&A' started by Ted, Nov 2, 2004.

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  1. Ted

    Ted Rookie

    Nov 3, 2003
    18
    Azle Texas
    Full Name:
    Ted Gage
    #1 Ted, Nov 2, 2004
    I just completed the installation of 17" 348 Wheels on the 308. Almost new tires came with the wheels. The front are P Zero 215/50ZR17's and the rear are 255/45ZR17's. I don't have a clue what recommended tire pressures are. No info on Pirelli''s site except for max pressure.

    Anybody got a recommendation?
     
  2. Mule

    Mule F1 Rookie
    Owner Rossa Subscribed

    Jun 25, 2003
    3,758
    Alaska
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    Mule
    #2 Mule, Nov 2, 2004
    What does the max pressure on the website and on the sidewall say? That is a good start for your upper limit, but I don't think that much is nearly neccessary.

    My Goodyear's max are 51 (almost the same size), but I have them at 35. Seem to be wearing evenly. It will probably take some experimentation to find the wear and ride best for your setup. One way is to see what the load rating is for the max pressure, multiply by four, then multiply by the percentage of your vehicle weight.

    Example: Say max load at 50 PSI is 1200 lbs. Times four is 4800. Your car only weighs about 3000 lbs. or .625 of the max. .625 of 50 PSI is 31.25 PSI. Maybe start around 32 PSI in this example, but use your numbers and weight.

    Can we see a picture? Sounds unique.
     
  3. Ted

    Ted Rookie

    Nov 3, 2003
    18
    Azle Texas
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    Ted Gage
    #3 Ted, Nov 3, 2004
    Here's the pix. Spacers from Hill engineering. Fast delivery, great quality. If anybody is interested, I'll post how I determined the final spacer thickness, based on a lot of input from Paul Hill.
     
  4. Mule

    Mule F1 Rookie
    Owner Rossa Subscribed

    Jun 25, 2003
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    #4 Mule, Nov 3, 2004
    That looks really nice. I think the wheels look better than they do on the 348.
     
  5. resnow

    resnow Formula Junior

    May 21, 2001
    653
    North Carolina
    Full Name:
    Bob Snow
    #5 resnow, Nov 3, 2004
    front wheels are on wrong sides. rear OK.
     
  6. mw575

    mw575 F1 Rookie

    May 30, 2001
    2,924
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    Martin J Weiner,M.D.
    #6 mw575, Nov 4, 2004
    I know this does not transpose directly to your 308 but I have found 33 psi perfect on my p zero's on my 575.
     
  7. Ted

    Ted Rookie

    Nov 3, 2003
    18
    Azle Texas
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    Ted Gage
    #7 Ted, Nov 4, 2004
    Sharp eyes. I didn't realize they were asymmetrical. Duh. The correct rotation must promote brake cooling. Thanks for the tip.

    Guess that means tire rotation is contraindicated.
     

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