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But the front motor probably only adds 50-75lbs or so....not enough to justify raising tire pressure so high. I mean honestly adding a passenger to the car adds more weight than the front motor does.
Googling a bit came up with a few interesting hits. Particularly this older thread where these guys run 60-70psi in 44max psi rated tires to get better mpg. Tire pressure above 44 psi? - CleanMPG Forums There was a mention of someone running 120psi and a mention from an engineer that said tires wouldn't spontaneously blow up until well after 200psi. I may go out and pump up my tires to 50psi and see if it makes any difference. It's probably negligible.
50K service on my S85 last week, tire pressure adjusted to 45psi per my service bill.
Which tires are you running? Michelin Primacy MXM4, Goodyear RSA2, something else?
So possibly the change to 50psi is only for the Michelin Primacy tires?Goodyear Eagle RS-A2, 19" of course
So possibly the change to 50psi is only for the Michelin Primacy tires?
My Model S has a TPMS warning for over inflation, as I found out in the descent going West from Truckee. The strange thing is, I tested the pressures at a rest stop and they weren't even 50 psi warm. So, they're either adjusting the TPMS as well, or my system is buggy.
So what about the TPMS?
incredulity alarm kicked in here.
If 245/45/19 is 50psi that means that 245/35/21 is going to be more like 56psi.
I dont know of any summer car tyres rated that high.
If an owner inflates to this pressure on a cool morning, then drives hard fully laden on a hot afternoon - that's way into the safety margin of the tyre and any tyre company will disclaim responsibility for failure.
It's not just structural failure here, but susceptability to failure instead of deflation from what would normally be minor damage too.
Somebody needs to get a statement from Tesla for the official position on this.
Also it makes it incredibly important that owners changing tires selects exactly an approved tire and there are a lot of subtle variations of apparently similar tires to the unwary. eg how many owners double check they have the correct load rating on replacment tires. i know I do now, but I have been caught out previously.
Furthermore as a safety concern Tesla S/Cs should be required to check the tires load rating and note it on the service sheet, and inform the owner the vehicle is unsafe where replacement tires are not to correct specification.
21s always have been lower PSI per Teslaincredulity alarm kicked in here.
If 245/45/19 is 50psi that means that 245/35/21 is going to be more like 56psi.
Well, here's the final answer: If you have a P85D with 19" wheels and your door jam sticker says 45psi, you can call or email your local SC and ask for the updated 50psi sticker. Just did this.
21s always have been lower PSI per Tesla
Mine were 39 or something for staggered 21s
I wonder if they raised PSI for bigger wheels as well
P.S. I'm running 42PSI on my aftermarket 20s with PSS tires