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Best tire pressures for custom staggered tire configuration?

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Musterion

18h 03m 37s −24° 23′ 12″
Jan 10, 2013
579
170
M8
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).
 
Post your brand/model of tires. And ideally from your sidewall, the load rating (lbs) at max pressure (psi).

@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?

According to here: 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...

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

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.