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Run Flat Tires

Discussion in 'Technical' started by DavidWexler, Jan 2, 2013.

  1. DavidWexler

    DavidWexler Member

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    I commute at night, when there's less traffic in Southern California. The stretch of hwy 101 I cover always seems to be under construction with lots of road hazards. To avoid getting stranded, I mounted run flats on my S's 19" wheels. The new generation of run flats are much better; not loud or harsh. I replaced the Goodyear Eagles with Bridgestone Potenza RE960AS Pole Position RFT 245/45RF-19. (Filled w/ nitrogen) They are very close in spec to the Goodyears. Same 1,653 lb load rating. A little better grip, AAA vs. AA. And a little faster speed rating V vs. W. They are 1/2" wider and a bit heavier (6 lbs/ea). So far I'm really liking them, and the V tread pattern looks kind of cool. I also carry the Tesla air pump w/ tire slime. At o-dark hundred, if I get a flat, I'm hoping to limp to my destination rather than be flatbeded to a closed tire shop or service center. At least that's my plan. I'm not sure why Elon & Co decided not to go with run flats on a car with no spare, but if I had to guess, it was because they didn't want the extra weight (24 lbs in total) and slightly diminished range. I don't think ride or handling were the issues. Having driven an 85 mile range Nissan Leaf for the last 21 months, the Tesla with 250 miles, has made my range anxiety suddenly nowhere to be found.
     
  2. strider

    strider Active Member

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    I think it also had to do w/ the lack of options in the 21" size. Tirerack only lists one run-flat option (Pirelli) for $500/tire.
     
  3. DavidWexler

    DavidWexler Member

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    Location:
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    IMG_7994-1.jpg
    Tesla air pump


    IMG_7996-1.jpg
    Slime refil


    IMG_7997-1.jpg
     
  4. agentsmith1612

    Joined:
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    Germany
    The answer ist very easy.
    At first run on flat tires are much more expensive and ask yourself how often do you get a flat tire?

    In got my dirving license 20 years ago and I had never get a flat tire.
     
  5. tdiggity

    tdiggity Member

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    Run flats are also a lot stiffer, so expect a more firm ride with them.
     
  6. Tesla 940

    Tesla 940 Member

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    They take up space!

    As for the "slime" - I got a tire plug kit from the autoparts store. If/when I get a flat I intend to use that instead of the "slime".
     
  7. mdh

    mdh VIN 2747 P4679

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    Are you seeing an impact to range?
     
  8. DavidWexler

    DavidWexler Member

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    Don't really know. Having too much fun with the car to keep logs and track data. I have however traded my Leaf range anxisity for parking lot anxisity. With the S I'm always parking in Egypt to avoid door dings.
     
  9. breno11car

    breno11car New Member

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    Nice Post. Thanks for sharing such a best information.
     
  10. gnelson

    gnelson Member

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    I am driving my second Corvette that cam with run flats. They are noisy, expensive and don't ride as well as tires with sidewalls that aren't as stiff. I finally got smart and bought conventional tires. I now have a 12 volt compressor in the Corvette and a tire repair kit. I will never buy run flats again.

    - - - Updated - - -

    I forgot to mention that you do not want to use tire sealant if your wheel has incorporated tire pressure monitors. The sealant may damage the sensors.
     
  11. JPP

    JPP Active Member

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    I have had run flats on my prior Lexus SCs and GSs and hated them--too stiff, too expensive, too hard for tire shops to dismount/remount, too limited a choice of tires when purchasing. BTW, if you have run flats, you get 50 miles of driving at 50 MPH, so an air compressor/slime is really redundant.
     
  12. gnelson

    gnelson Member

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    I had no problems driving on a run flat with zero air pressure. It was a problem to find somebody to fix one. Most tire places refuse to touch them.
     
  13. AlMc

    AlMc 'Senior Moments' member

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    I am told they are difficult to repair and once 'flattened' are susceptible to future damage. If you do get a flat on a run flat tire it should be replaced, not repaired.
     
  14. JPP

    JPP Active Member

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    My tire shop would never fix run flats--especially if actually driven any distance without air pressure. They are expensive throw-aways.
     
  15. deonb

    deonb Active Member

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    Since Tesla sells a Tesla-branded tire repair kit that contains sealant specifically for the Model S, without any warnings about potential TPMS damage on it, I assume they've determined it to be safe. Either way, they'll be on the hook for warranty-replacing the TPMS sensor if their sealant damages it:

    http://shop.teslamotors.com/collections/model-s/products/tire-repair-kit-model-s
     

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