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Got New Primacy Tires on the Rear and now Car handles Weird...

Discussion in 'Model S' started by bareyb, Sep 23, 2017.

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  1. bareyb

    bareyb Active Member

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    Has anyone noticed weird handling with the Primacy Tires on the Freeway? I just had the rears replaced and now the car is all over the road. The steering kind of jerks back and forth almost like it's following the rain grooves in the Road. It's quite unsettling.

    Is the because of the Tires or is this an Alignment issue? Makes it super hard to relax while driving at hight speeds. Anyone else noticed this???
     
  2. Xenoilphobe

    Xenoilphobe Active Member

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    Check the torque on your lug nuts.
     
  3. Don85D

    Don85D Member

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    I would test this recent change in behaviour by placing the newest tires on the front. If the problem goes away it was due to worn front tires. I had a similar issue with a BMW using the early generation of run flat tires. My sport suspension didn't like the run flat tires and tram lining was the symptom which sounds like your description of symptoms.

    Alignment with increased caster can correct this to a degree but more than a few times I have chased strange suspension issues to find they were caused by the tires. Moving the worst tires to the back axle fixes a lot of problems.
     
    • Like x 1
  4. dhanson865

    dhanson865 Active Member

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    +1 on checking lug nuts but also check tire pressures. If the pressure is too low or two high it will change the ride considerably.
     
  5. patrick40363

    patrick40363 Member

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    Take it back to the place that put the tires on.
     
  6. Nosken

    Nosken Member

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    My Primacys "hunt" all over in grooved roads, but not smooth pavement.
     
  7. Dborn

    Dborn Confirmed

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    Just put primacy 3’s on all 4 wheels. Absolutely superb road holding and quietness. 19in.
     
  8. chipmunk

    chipmunk Member

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    Actually, we have two Model S’s with 19 inch wheels. One pre-refresh 2015 with Michelin Primacy tires and the other post-refresh 2016 with Goodyear Eagle Touring tires on the new wheels. The Goodyear’s have far less road noise...assuming that isn’t somehow related to the newer wheels.

    Edit: and neither of them have any hunting issues on smooth pavement.
     
  9. kort677

    kort677 Active Member

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    you could also make certain that the tires were properly balanced, are these directional tires? if yes maybe they were installed wrong
     
  10. Retired

    Retired Member

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    Do you have the same tires on the front. If different mfger or just a different model tire from the same company, that can cause problems exactly as described due to different sidewall flexibility.
     
    • Like x 1
  11. dsm363

    dsm363 Roadster + Sig Model S

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    Agree. How worn are the front tires? Typically best to replace all 4 tires at the same time if possible.
     
  12. mspohr

    mspohr Active Member

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    You should really replace all four tires at once. New tires mixed with worn tires will not handle well.
     
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