Arachnid Tire Pressure

[MartyL]

What is the proper pressure for the Arachnid tires?

 

[Tech_Guy]

I keep mine at 42 which I believe is the recommended pressure for 21” wheels

 

[MartyL]

I ask because I just had them installed and the car's display says they are at 46.

 

[bishoppeak]

Should be 42 cold front and rear

 

[MartyL]

Thanks all.

 

[Tech_Guy]

Should be 42 cold front and rear

Agreed definitely check them in the morning when they are cold and adjust them to 42

 

[ishareit]

same for 21inch turbines?

 

[bishoppeak]

same for 21inch turbines?

Yes

 

[Miles88]

Had my Arachnids installed today on P85D. SC set tire pressures at 47 all around. Fairly harsh ride home. Lowered to 44 at home, and came here. Door sticker says 45 psi, but that’s for 19” Michelin Primacy.

 

[Tech_Guy]

Had my Arachnids installed today on P85D. SC set tire pressures at 47 all around. Fairly harsh ride home. Lowered to 44 at home, and came here. Door sticker says 45 psi, but that’s for 19” Michelin Primacy.

42psi for 21” wheels

 

[CSFTN]

Staggered vs square, pressure is the same?

 

[dark cloud]

Staggered vs square, pressure is the same?

Here's what I got from an older service manual. Tire pressures are pretty much adjust to taste; for 21" tires anywhere from 35 to 45 is safe, all long as you don't exceed the maximum stated on the sidewall of the tire, from there do you like a softer or firmer ride? The former might give a lower lap time, but the latter will yield higher range. Carrying 4 passengers and luggage on a road trip? increase them. Not many people do this.

 

[AMPd]

That info should be on the tire

 

[brookman]

Never go by the pressure on the tire. That is the recommended max. Always go by the pressure listed on the sticker on the door jamb of the driver's door.

 

[JPP]

Never go by the pressure on the tire. That is the recommended max. Always go by the pressure listed on the sticker on the door jamb of the driver's door.

...so I will be deinstalling the OEM 19" wheels on my wife's 2015 S70D and installing the referral award 21" arachnids. Door sticker only reflects 19" tires so pressures (45 PSI) will not be correct. is there a 'replacement' door sticker with the correct pressures for the staggered 21s (I assume 42 PSI)?

 

[Tech_Guy]

no you won't get a replacement door sticker though you could ask... just set your tires to 42 psi with the 21" and you will be fine

 

[FlatSix911]

Here's what I got from an older service manual. Tire pressures are pretty much adjust to taste; for 21" tires anywhere from 35 to 45 is safe, all long as you don't exceed the maximum stated on the sidewall of the tire, from there do you like a softer or firmer ride? The former might give a lower lap time, but the latter will yield higher range. Carrying 4 passengers and luggage on a road trip? increase them. Not many people do this.
View attachment 443323 View attachment 443324

The correct answer based on the Tesla chart is 40 PSI ...

 

[JPP]

The correct answer based on the Tesla chart is 40 PSI ...

View attachment 444124

Thanks--wow, 40 PSI. Seems low for a Model S. The spec for my P3D+ and 20" square setup Michelins is 42.

 

[CSFTN]

I set all 4 for 42 psi

 

[JPP]

I set all 4 for 42 psi

OK thx.