Correct PSI for my new tires?

[gasemup]

I just got Michelin All Season 4 tires that have an increase load (102) compared to OEM. Discount Tires said to fill them to 36 psi. Is that right? If I do it cause a low tire pressure alert.

2015 Model S 70D

 

[ucmndd]

Crank 'em up to 45. Discount Tire always under-fills my new tires.

 

[Gixx1300R]

I just got Michelin All Season 4 tires that have an increase load (102) compared to OEM. Discount Tires said to fill them to 36 psi. Is that right? If I do it cause a low tire pressure alert.

2015 Model S 70D

The correct tire pressure should be listed on the sidewall of the tire

 

[paulk]

The sidewall lists the tire’s max pressure, not the recommended pressure.
The recommended comes from the vehicle manufacturer sticker in the drivers door jamb. For model S, it’s 45 psi.

 

[ucmndd]

The correct tire pressure should be listed on a sticker inside the door jamb.

FTFY

 

[airborne spoon]

The door jamb should say 42 psi but verify on your car and fill to that level. Remember tire pressure should be checked when the tire is cold the air around the tire doesn't need to be cool just the tire itself should be cool

 

[ucmndd]

The door jamb should say 42 psi but verify on your car and fill to that level. Remember tire pressure should be checked when the tire is cold the air around the tire doesn't need to be cool just the tire itself should be cool

Every Tesla I’ve ever seen delivered with 19s says 45.

 

[UncleCreepy]

Capt. Obvious says it's also listed in the manual. Guessing is more fun though, so I'll go with Douglas Adams and say the answer to the ultimate question of life, the universe, and everything (including tire pressure) is 42.

 

[airborne spoon]

Every Tesla I’ve ever seen delivered with 19s says 45.

The OP doesn't mention rim size so I always default to my cars settings, which is why I say to check the door jamb.

 

[murphyS90D]

21" rims are 42 psi.
19" rims are 45 psi.

The sticker on the door jamb reflects the wheels/tires that were delivered with the car.

 

[gasemup]

Thanks for the responds but I’m not sure you guys are answering my question. What I’m saying is that because the new 19” tires have a higher load capacity the tire store said I should use a 36 psi instead of the 45 psi written on the door jamb (they calculated it).

So do the new tires increased load capacity change the default psi?

According to this website they are correct. Tire Pressure Calculator

 

[UncleCreepy]

The load capacity has no impact on the correct tire pressure. Unless you bought wider than stock tires there is no reason why the tire pressure should be reduced.

 

[ucmndd]

Leave them at 36 if you want, but there’s no way to do that without a perpetual tire pressure warning.

So either pump them up to what Tesla wants them to be or deal with the dash warning for the next 50,000 miles.

 

[Russell]

Thanks for the responds but I’m not sure you guys are answering my question. What I’m saying is that because the new 19” tires have a higher load capacity the tire store said I should use a 36 psi instead of the 45 psi written on the door jamb (they calculated it).

So do the new tires increased load capacity change the default psi?

According to this website they are correct. Tire Pressure Calculator

Regardless of the psi you set it to, I would check the tread depth every 3k-5k miles to see if it's wearing evenly. That will tell you if your tires are inflated properly.