Tesla Updated Tire Pressure Guideline to 50 PSI for 21" Tires?

[SomeJoe7777]

I did some calculations for safe tire pressure range for 21"s using the following parameters:

Tire: Continental Contisport Contact 5P, 245/35R21, XL load range, 96Y service description, 51 psig max inflation pressure
Car: P100DL, Curb Weight 4941, GVWR 5997, Max Cargo+Passengers 1054, GAWR Front 2866, GAWR Rear 3131, Top speed 155

For this tire, the safe pressure range is 42 - 51 psig.

For staggered setups, I also analyzed the following:

Tire: Continental Contisport Contact 5P, 265/35R21, XL load range, 101Y service description, 51 psig max inflation pressure
Car: P100DL, Curb Weight 4941, GVWR 5997, Max Cargo+Passengers 1054, GAWR Front 2866, GAWR Rear 3131, Top speed 155

For this tire, the safe pressure range is 39.8 - 51 psig. However, this tire can only be used on the rear axles.

Tesla calculated the same, and selected 42 psig as the placard pressure because it's safe and offers the least objectionable ride quality.

 

[n2mb_racing]

Would higher pressures reduce the chance of rim damage and blowouts from hitting potholes? That would be a good reason to increase the pressure.

 

[Shock-On-T]

Would higher pressures reduce the chance of rim damage and blowouts from hitting potholes? That would be a good reason to increase the pressure.

Higher than recommended pressure would reduce the chance of rim damage but increase the chance of blowout (which would then cause rim damage lol).
Lower than standard pressure greatly increases risk of blowout due to overheating by over-flexing.
The manufacturers recommended pressure is recommended for a reason. It's the sweet spot.

 

[NikeWings]

Recent SvC tire replacement. Riding on staggered 21" ContiSilent Sports

Checked for active faults: No active faults found (2/7/2017).
- Checked firmware version: Staged to Updated latest version 8.0 (17.6.15).
- Inspected the 12V positive jump post.
- Topped off washer fluid.
-Torqued wheels to 175 NM.
- Check and adjust tire pressure to: 45 PSI front, 45 PSI rear
- Measured tire tread depth at:

(Outer) (Center) (Inner)
LF: 8/32 8/32. 8/32
RF: 10/32.10/32 10/32
LR: 8/32. 8/32. 8/32
RR: 8/32 8/32 8/32

 

[mcdonsco]

So I swapped from my 21" turbines to my 21" arachnids the other day and Tesla had them at 50 psi warm, was about 45+ cold. I had my turbines at 42 warm. Called them and guy said should be 45 cold per door panel, I was driving at the time so couldnt check while on the phone. Turns out my door says 42 cold, and tires themselves say max 50.

...soooo....settled on 44 warm.