Air pressure

[wino]

My Michelin Super Sports have max psi of 50lbs. I do not race and I live in a warm climate. What should my front and rear tires be inflated to?

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[Emspilot]

You’re kidding, right?

 

[J29DB03]

 

[Thraxbert]

Open your driver's side door. Look down. It's towards the rear tire. A sticker. It will tell you what PSI to use. All cars have this sticker, and should be followed.*

* there are a small number of exceptions

 

[Andrew__a90]

My Michelin Super Sports have max psi of 50lbs. I do not race and I live in a warm climate. What should my front and rear tires be inflated to?

I go by Euro Spec, 34 front 32 rear.

 

[Supra_UK_]

Supra has a 50/50 weight dist so go with tyre pressure 2.2 bar all 4 (*2.6 of heavy loaded)

You can also go on the menu vehicle info / tyre pressure, the figures will change in real time depending on weather and it will reccomend changes if needed.

 

[wino]

I go by Euro Spec, 34 front 32 rear.

Why does US spec say 38 front and back? Is there a Euro reg to use lower end psi, perhaps for environmental reasons? Tire rubber is a big pollutant.

 

[wino]

Higher inflation= shorter life = more pollution. I'm going with 38. Seems like factory settings for US under inflation is different from Euro. I get an under inflation warning at 30psi.

 

[Andrew__a90]

Why does US spec say 38 front and back? Is there a Euro reg to use lower end psi, perhaps for environmental reasons? Tire rubber is a big pollutant.

Bingo my friend, it’s all for better fuel economy. Same reason why we use OW20 instead of 5W30 like the Euros. Both of these decisions were made to improve fuel economy

 

[Thraxbert]

yup. US DoE says every 1 PSI reduction in tire pressure = 0.2% less fuel economy. So by setting l the tires to 38 in the US, every Supra is ~1% more fuel efficient than the Euro 34/32.

As another data point, I believe the AU door sticker calls for 32/32.

 

[puzzled]

I run 45 psi..




.. in winter while hibernated.

 

[BMWAF]

Is everyone running at 32/32psi?

I got my car back from a service and the car felt really bouncy bashing some B roads. I checked my tyre pressures afterwards as I assumed the grease monkeys just over filled the tyres but it was bang on 32 all round.

Maybe I had been running a lower pressure before hand?

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