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Replacement Tires 20 in Rims

Discussion in 'California(Portofino)/Roma(Amalfi)' started by alberto, Oct 8, 2010.

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  1. alberto

    alberto Formula 3

    Aug 25, 2001
    2,404
    San Diego
    Full Name:
    Alberto
    #1 alberto, Oct 8, 2010
    I have 20 inch rims with Pirelli Pzero 245 and 285/35 - 20 tires. They have a bit under 7000 miles but I recently damaged a front tire. Not sure that I want to replace just one given that the remainder don't have a huge amount of useable tread left (a couple of mm's above the tread wear indicator left). Tirerack shows only the Pirelli's and Continentals as matching pairs in the original size. Tirerack reviews for Pirelli PZero's confirm that this high wear rate is common for this tire. Anyone have an alternative to recommend that might be a bit longer lasting?
     
  2. mgv1

    mgv1 Formula Junior

    Feb 6, 2006
    496
    San Francisco
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    Mark V
    #2 mgv1, Oct 8, 2010
    The Pirelli's are soft (Swiss cheese has a better wear rate) and don't grip well until warm for some reason. This means you usually get about 4-6K depending on use and vehicle. I'm currently out of tread at 6K with a set on a Maserati Gran Turismo S. Tire rack doesn't have much in this size but if you go a bit wider to a 295/35/20 from the 285 then there are more to choose from at other places.

    Financially this works out about 25c/mile for a cheaper set or over 50c/mile for a more expensive set so if you are going to just driving around and don't care about the ultimate track setup then you could go with a set of Nitto Invos that run around $290 for the 295 rears and $250 for the 255 fronts. They have good dry weather grip but are not optimized for wet weather. Toyo also does a Proxes model but I think it was designed for lighter types of cars.

    In the standard size there is the Continental Sport Contact 3 or Dunlop Sport MAXX which are about $350 and are a so so tire but no one seems to rave about them.

    If you do go to a 295 profile then when the actual vehicle speed is 65mph then the speedo would read 64.4mph as there's a very slight difference in rotational size.

    Hope this helps.

    Mark
     
  3. not4one

    not4one Formula Junior

    May 23, 2010
    887
    CT, FL
    #3 not4one, Oct 8, 2010
    That's exactly what I was thinking of doing; 295's on the rear and 255's on the front. May lose a nominal amount of handling feel, but gain efficiency, better ride and a wider look. Plus they'll fill the wheel wells a little more. I don't think you'll notice a ride height difference.
     
  4. alberto

    alberto Formula 3

    Aug 25, 2001
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    San Diego
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    Alberto
    #4 alberto, Oct 8, 2010
    I was thinking along the same lines. I too am looking for a Maserati GTS. I am hesitant about going to 295 because of clearance/rubbing. Any experience (would likely be about the same clearance issues as with California) with going to the larger size?

    The other option I am considering is 275/35 for the rear. The size difference is also pretty small compared to OEM sizes. You loose 10mm (< 1/2 inch) in width, about 3mm in sidewall height. Hankook makes a very good tire (Ventus V12) in this size with matching 245/35 for the front for WAY less money than anyhone else (about 1/2) and the autocross and track guys tell me it's a great tire. Any thoughts?
     
  5. not4one

    not4one Formula Junior

    May 23, 2010
    887
    CT, FL
    #5 not4one, Oct 8, 2010
    Looking at the clearance that exists now I don't see how there would be an issue going one size larger...295/255. If I'm wrong, a small spacer would solve it. In terms of 275 on the rear, in my opinon I think the look/stance would suffer.
     
  6. alberto

    alberto Formula 3

    Aug 25, 2001
    2,404
    San Diego
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    Alberto
    #6 alberto, Oct 8, 2010
    Spacers are a deal killer for me. I'll have to check out the clearance and see if the larger size will work without them.
     
  7. mgv1

    mgv1 Formula Junior

    Feb 6, 2006
    496
    San Francisco
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    Mark V
    #7 mgv1, Oct 9, 2010
    I think the Maserati has clearance for a 295 profile and most other cars should too as it's not that much greater than the 285. I would NOT go to the 275 as this would reduce the contact patch even further than standard and with these heavy cars it will definitely affect wear and handling. Also due to the narrower fit of a 275 the wheel rim may be more exposed depending on what brand of tire and would be more easily damaged.
     
  8. RickLederman

    RickLederman F1 Rookie
    Rossa Subscribed

    Sep 18, 2007
    2,837
    Swanton Ohio
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    Rick Lederman
    #8 RickLederman, Oct 9, 2010
    My front PZero's still have some tread after 14,600 miles.
     
  9. mgv1

    mgv1 Formula Junior

    Feb 6, 2006
    496
    San Francisco
    Full Name:
    Mark V
    #9 mgv1, Oct 10, 2010
    The fronts will last longer but you must be one careful driver. Get that thing out to some twisty roads Rick and open her up a bit, these cars were designed to wear the tires out not replace them due to old age.
     

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