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Bridgestone Tires - trouble with negative camber?

Discussion in 'Model S: Driving Dynamics' started by rpavlicek, Sep 5, 2013.

  1. rpavlicek

    rpavlicek ***** Neophyte

    Joined:
    Feb 7, 2013
    Messages:
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    Location:
    Santa Clara, CA
    Does anyone have experience with these tires on the Model S?

    Bridgestone Potenza RE970AS Pole Position

    Overall the reviews indicate the tire is excellent except I found this:

    ...since the model S has negative camber in the rear, this had me worrying.
     
  2. simplesolar

    simplesolar Member

    Joined:
    Jun 30, 2013
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    250
    Location:
    SoCal
    no tire can be recommended from manufacturer with negative camber aligned cars. They will all wear unevenly due to the setup. What you can do is get non-assmetrical tires so you can swap the directions and balance the wear.
     
  3. gtimbers

    gtimbers Member

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    Jan 9, 2013
    Messages:
    125
    Location:
    Van Nuys, Ca.
    Your energy usage will go up with the Bridgestone RE970's. Look at the TireRack test data on that tire. It may cost you as much as 5% over the stock Goodyear tires. You now have an option of the Michelin Pilot A/S3. There is a brand new comparison test on Tirerack indicating that this tire is really good also. It is several percent more efficient than the RE970. I have about 1200 miles on a set and they perform incredibly well. I am showing about a 1%- 2% range loss so far, although the weather got hot at about the same time as I got the new tires.
     
  4. mgemmell

    mgemmell Scottish chap

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    Jan 11, 2012
    Messages:
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    Location:
    Madrid, Spain
    Interesting negative camber comments... I put Bridgestones on my Roadster on Monday and had them replaced today with Mitchelins as I was finding the car impossible to control properly. It just wouldn't go in a straight line. It would rock one side and then the other... rocking to the left made it turn to the right and vice-versa.

    The sidewall of the Bridgestones is very stiff... may have something to do with it, but either way, I cannot recommend them for the Roadster. The model S has 2k kms on the clock so no new tyres yet :)
     
  5. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
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    12,743
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    Texas
    I wonder if the loaded radius is lower on the Bridgestones? Reducing the loaded radius (distance between the center of the hub and the ground) reduces the trailing distance of caster* and can cause that kind of behaviour.

    * Although caster is measured and set as an angle, the angle doesn't really mean a whole lot. What caster really is, is the distance from a vertical line through the center of the hub (at ground level) to the spot where a line drawn through the ball joints intersects with the ground. Because the distance is measured along the ground, loaded radius has a lot to do with caster's trailing distance. Too little caster makes the car unstable, too much causes the wheels to shimmy back and forth (like a bad shopping cart's wheel).
     

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