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Tire pressure monitoring

Discussion in 'Model S: Driving Dynamics' started by Mario Kadastik, Sep 18, 2013.

  1. Mario Kadastik

    Mario Kadastik Active Member

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    I'm curious, how is it done? A precise measure would be if there were a sensor inside the tire however that seems unlikely as people use 3rd party rims and tires and I assume people rotate/replace the tires at home or have a local grease monkey do it. Here in Estonia we need to swap out the tires twice a year anyway because we need real winter tires for the Nov-Mar timeframe so that's also the time we get them rotated. I'm just wondering how can Tesla measure the pressure accurately without a sensor in there. So tech educate me :)
     
  2. Lloyd

    Lloyd Active Member

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    There is a sensor in each tire that has to be moved/replaced if you use aftermarket rims.

     
  3. mnx

    mnx 2013 P85

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    Tesla uses a sensor inside the tire. Other systems such as those from BMW utilize the ABS system (monitoring each wheels rpm's etc. to detect a sudden loss in pressure)
     
  4. Mario Kadastik

    Mario Kadastik Active Member

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    Where is the sensor? Because the way they swap the tires on the rims (I usually replace tires, not rims between winter and summer tires) they stick various utensils between the rim and tire and squeeze etc so I'm afraid there might be damage if the sensor is somewhere in the way.
     
  5. araxara

    araxara S-P85#3,218 X-90D#3,299

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    Here is a generic picture that shows how most modern TPMS sensors are installed and located. Pretty much all European cars have similar sensors and tire shops should be familiar with replacing tires and not damaging the sensors.
    274647770_450.jpg
     
  6. GDH

    GDH Banned

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    Anyone know what Tesla charges for these or where is a good place to get them?
     
  7. Dreamin

    Dreamin Member

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    Tesla = $125/ea
    Tirerack.com = $97/ea
     
  8. GDH

    GDH Banned

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    damn.
     
  9. bsd

    bsd Member

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    How compatible are these TPMS with other brands of wheels? If I order a set of Tirerack's sensors, are they likely (or unlikely) to work with another set of wheels?

    I already have a set of Replika R141 wheels awaiting, which look virtually identical to the Tesla OEM 19" wheels. Tirerack cautioned that they could not guarantee compatibility with anything except their own wheels, but wouldn't really say how often such incompatibilities arise...
     
  10. Dreamin

    Dreamin Member

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    You should be fine. It's rare that a TPMS wont fit a modern wheel - I believe the fitment issues are with more exotic 3-piece wheels, or wheels with the valve hole in the middle of the barrel. For these wheels, the TPMS is banded to the wheel.
    You can ask the wheel mfg if the wheels are compatible with common TPMS's.

    Untitled-1 copy.jpg
     
  11. ChrisMason

    ChrisMason Member

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    TPMS from the Tesla Service Centers are now $50 each.
     
  12. lsnetman

    lsnetman Member

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    Alternative option, with an iOS/android app as well: FoBo Tire. Google them. Works great!
     

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