Tire Pressure ? - Chicagoland Sportbikes
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post #1 of 6 (permalink) Old 02-05-2005, 07:48 AM Thread Starter
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Tire Pressure ?

Me and a friend have a difference of opinion on tire pressures for our cars. Every car has a sticker that states tire size and proper tire pressure for that specific vehicle. One car I have says to inflate the tires to 30 psi. On the side of the tire it says "max. pressure 44 psi". I keep my tires at 30 psi. The link is to the goodyear website. It also states proper inflation is what the manufacturer suggests and not what is on the tire. So here is my question for you. How many of you actually know about this sticker? What do you inflate your tires to? Who do you think is right, me or my friend?



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post #2 of 6 (permalink) Old 02-05-2005, 09:19 AM
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I always go by what is on the tire. Back when I used to fill tires for a living, the rule of thumb was 35psi unless otherwise requested.

If I was hitting some twisties in a Ferarri, I would inflate to the car manufacturers specs.
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post #3 of 6 (permalink) Old 02-05-2005, 09:19 AM
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You should inlfate them typically to what the manufacturer recommends. The engineers selacted that pressrue to match the suspension components/set-up and strike a compromise between ride, handling and economy. The tire pressure is often dependent on vehicle weight. So a 2500lb car with the same tire width as a 3500lb car will have often a lower pressure recomendation.

That being said, I sometimes increase my pressure 1-2 psi on long freeway trips ot improve mileage and reduce wear. I will also increasde my rear tire pressure 1 psi to better balance the handling of the car. Most cars on the road are set-up to understeer to be more user friendly for the common unskilled driver.... so they are less likely to lose control.


Most of all inflating them too high really makes the car ride rough on most roads. and on rough roads, you will actually get lower mileage and increase tire wear because the tire will have a greater tendency to lose contact with the pavement.
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post #4 of 6 (permalink) Old 02-05-2005, 09:31 AM
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Me personally I go by the Tire pressure per say. I don't inflate the tire to Max, But I go by the tire manufacture do to they specialize in the tires NOT the car manufacture. There are alot of factors that go into tires, Materials used, the type of car they are made for etc.

I AGREE with your friend


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post #5 of 6 (permalink) Old 02-05-2005, 09:39 AM
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I think this sounds like the Ford Explorer, situation here. For style Ford, put big tires to meet the demand of the public. One thing though, once properly inflated to Firestone's, specification. The Explorers, had a high roll over risk so in order to keep the big tires on the SUV's. Ford, made up stickers that indicated the tire inflation to 22lbs and not to Firestone's recommended pressure of 35lbs.

We all know what happen then I'd go by whats on the tire.

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Last edited by Naked Bandit; 02-05-2005 at 09:45 AM.
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post #6 of 6 (permalink) Old 02-05-2005, 10:22 AM
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I usually fill tires on customer's cars to 32-35 psi, heavier vehicles like full size trucks and SUVs I fill to 40 (if they have 44 psi max tires). In my opinion car manufacturers recommend lower tire pressure that they should really be run at so the cars will have a more plush ride that most people like. I personally don't like the mushy feeling that comes with having the tires inflated to the specs most car manufaturers recommend. On my beater 89 Celica I keep them at 32 psi, my Tundra 35 psi (the tires are 35 psi max otherwise I'd keep them at 40).

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