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Best tire pressures for custom staggered tire configuration?

Discussion in 'Model S: Driving Dynamics' started by Musterion, Sep 19, 2013.

  1. Musterion

    Musterion 18h 03m 37s −24° 23′ 12″

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    I've searched through the various tire pressure threads and while we now all agree on the tire inflation pressure specs for the S60 (19" wheels), S85/P85 (19" and 21" wheels), I can't find the answer to this. For a custom staggered configuration of 245/40-20" (front) and 275/35-20" (rear) which I've just implemented--following others here--what would your recommended tire inflation pressures be? Should we interpolate between the S85/P85 21" (42psi) and the P85+ staggered 21" specs (?? psi front/?? psi rear)? Note this setup is 20" wheels but wider in rear than P85+. (Pics pending).
     
  2. Dreamin

    Dreamin Member

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    Post your brand/model of tires. And ideally from your sidewall, the load rating (lbs) at max pressure (psi).
     
  3. mnx

    mnx 2013 P85

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    According to here: Tesla Model S Buyers', Delivery and Owners' Guide
    The p85+ specs are 38/40psi f/r.

    In my p85 with 19x8.5 wheels and 245/45 tires I found that for even temperature across the tread I should be running ~40psi front/41psi rear. I still run 45 all around for everyday driving to keep rolling resistance down however...
     
  4. Musterion

    Musterion 18h 03m 37s −24° 23′ 12″

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    @dreamin, thanks for responding. I didn't post the ratings because close or better than stock 19" and 21", but here are the details. Mine are Hankook Ventus S1 noble2 245/40ZR20 (1709 lbs. max load/50psi max pressure) and 275/35ZR20 (1874 lbs. max load/50psi max pressure). Compare to stock 245/45R19 at 1653 lbs./51psi max (Tesla spec = 45psi) and 245/35ZR21 at 1565 lbs. max load/51psi max pressure (Tesla spec = 42psi). Your suggestions for the staggered 20" config?

    @mnx, this is very useful. I had the TSB but forgot it had the P85+ inflation specs. From that I gather Tesla is choosing to go with larger contact patch for the staggered tires, trading off some efficiency for dynamic performance.
     
  5. johnmodels

    johnmodels Member

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    I have the same staggered setup and inflate to 45 all around.

    john
     
  6. Musterion

    Musterion 18h 03m 37s −24° 23′ 12″

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    Thanks John, yours was one that I looked at to figure out my setup. I noticed you also commented elsewhere on rear tire wear. Have you tried other lower or different front/rear pressures like P85+ and noticed any different handling or wear issues? Sounds like @mnx actually measured temperature across the tread which is cool.
     

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