Why does the P85+ get lower tire pressure than the S85 or the P85? Ignore the stagger for a moment. Let's focus on the front tires. Same width, similar diameter. Bigger rim. So a lower volume of air with a lower pressure (maybe a stiffer sidewall) but still it seems to imply much lower protection for the rim. It probably reduces noise and improves ride comfort but at what cost? Other manufacturers (Porsche and BMW for example) seem to increase recommended tire pressure as rim diameter increases (particularly if width is constant). My daughter borrowed the Tesla the other night. (The Prius was in for service.) A landscaping truck in front of her lost a few rocks. She started to swerve around them, but an oncoming car was just onto my daughter's side of the double yellow line. So faced with the choice of hit the oncoming car or hit the rocks. She chose the rocks. Net result: one trashed tire and two bent rims. I am trying to decide if I should replace the rims and run 42-45 psi to give them some protection or buy a staggered set of 19s from TireRack. I was thinking of the BBS RX-Rs in 19*8.5 and 19*10 with 245/45 19 and 275/40 19s. Any advice or other suggestions?