All Season Tires - Pressure?

[funnyspeechguy]

Just took Megatron home today!!!!!!!!

I noticed in the Service menu that the PSI on all my tires was 49 but that Tesla recommended them all at 50. The tires are the Pirelli Scorpion ATR 285/65 - R20 - 116H. I don't want to overinflate them, so any recommendations on what PSI to get them to?

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[AlmostHuman]

https://www.tesla.com/ownersmanual/cybertruck/en_us/GUID-B3DD905E-4642-4B5C-9149-480CA2C4F177.html

 

[igs]

The Pirellis have a max psi of 51, which seems very low, all the aftermarket tires I've seen of the same size have a max psi of 80.

 

[XCeilidhX]

The Pirellis have a max psi of 51, which seems very low, all the aftermarket tires I've seen of the same size have a max psi of 80.

This seems crazy. The max is 1 psi over the recommended? So if it gets hotter by like 15 degrees then you could be in an overinflated burst risk category and the manufacturer could call it user error if so and say not our fault if a tire blows? Another reason for me to dislike Pirelli tires. It is not reasonable to design a tire specifically for a vehicle and have the max psi just 1 over the recommended psi. Temperatures change. People cannot always be constantly monitoring the tire pressure and adjusting it day to day. In reality i’m sure there is more leeway, or i would hope so, but that is just plain weird. I mean, WTF?

Am I crazy or is this unusual?

Cheers

 

[Jack27]

Just because they “recommend “ doesn’t mean everyone runs the same pressure. Other then if you’re psi light in the CT is lit up I wouldn’t worry about 1 pound of pressure

 

[XCeilidhX]

Just because they “recommend “ doesn’t mean everyone runs the same pressure. Other then if you’re psi light in the CT is lit up I wouldn’t worry about 1 pound of pressure

My concern isn’t the 1 psi difference in terms real world effect. It is the lack of confidence in the tire because it has (perhaps) no built in buffer. Typically the max would be 10 or 15 psi higher than the recommended operating pressure, at least. Personally I’ve never had a tire that said that the cap was 1 psi higher than what the manufacturer suggests you run with. It makes me think the tire is lackluster in terms of robustness and safety. But maybe it’s just me. I prefer things to be overengineered rather than minimally meeting spec whenever possible. Seems safer to me.

Cheers

 

[Jack27]

My concern isn’t the 1 psi difference in terms real world effect. It is the lack of confidence in the tire because it has (perhaps) no built in buffer. Typically the max would be 10 or 15 psi higher than the recommended operating pressure, at least. Personally I’ve never had a tire that said that the cap was 1 psi higher than what the manufacturer suggests you run with. It makes me think the tire is lackluster in terms of robustness and safety. But maybe it’s just me. I prefer things to be overengineered rather than minimally meeting spec whenever possible. Seems safer to me.

Cheers

Does any tire say “you can run over manufactures recommendation” ? Seems like that would be a liability if something went wrong and my guess why they said 1psi ! Cover there ass

 

[XCeilidhX]

Does any tire say “you can run over manufactures recommendation” ? Seems like that would be a liability if something went wrong and my guess why they said 1psi ! Cover there ass

of course no tire company says that. But usually the recommended psi for the vehicle is way under the max psi for the tire so if you go over the vehicle’s recommendation by 3 or 5 psi you are still way under the max rating for the tire and there is no issue. This is odd in terms of not being that way.

Cheers

 

[Jager]

Tire pressure specs from manufacturers are all based on "cold" pressure. There's no issue with an actual "hot" pressure coming in above "cold" spec.

Manufacturers certainly know that tires, when driven, will increase psi by ~10% or thereabouts from their "cold" spec.

 

[Feathermerchant]

Yes tires inflation pressure are always 'cold' pressure increases as tires warm from driving. I've seen 1-2 psi difference from one side of the vehicle being in the sun. See this on Tirerack. It shows the difference in maximum inflation pressure for different load range tires.
TLCR - LT Load Range C tires (CT All-season) 51psi
LT Load Range D tires (CT All-Terrain) 60psi

BTW this info along with the allowable weight carrying capacity is on the very sidewalls of your tires.

 

[ABILISK]

I run my Pirelli’s at 50 cold, after driving a little bit in TX they get up to 54-55. I launch my beast every chance I get and corner them hard. I love the sound of tire screech taking sharp turns at 70 mph. Never an issue, no sidewall bubbles or anything. 50 psi is fine, even when you’re as mean to your tires as I am.

 

[zeusss]

With 2lbs low I lost around 20wh of efficiency on my AS tires. I tested by dropping 2lbs and replicated it. They're really happy at 50psi cold...Efficiency wise.

 

[igs]

These Pirellis are pricey

 

[Gaximus]

The Pirellis have a max psi of 51, which seems very low, all the aftermarket tires I've seen of the same size have a max psi of 80.

Is it Max PSI or Max PSI to seat the bead? I sometimes get these mixed up because of how they print these on the tire.

 

[igs]

Is it Max PSI or Max PSI to seat the bead? I sometimes get these mixed up because of how they print these on the tire.

Max PSI. The reason is the Pirellis are Passenger tires and the Goodyears are Light Truck. Light Truck tires have a higher ply rating and are usually 80 PSI Max. Passenger tires have a lower ply rating and are usually 44-51 PSI Max.

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