Tire Air Pressure

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MotleyCrue
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Tire Air Pressure

Post by MotleyCrue » Fri Oct 23, 2009 11:03 am

What do you pump yours up too?

I guess the normal is suppose to be 30 psi (The sticker on the door is a bitch to read!), but I did 34 psi on the weekend and I can feel every crack I run over. They are filled with Nitrogen but they still have been losing air because of the cold temperatures, so I just fill them up with O2 now. The tires say max 50 psi, crazy.
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ANGUS
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Re: Tire Air Pressure

Post by ANGUS » Fri Oct 23, 2009 12:12 pm

I air mine up cold at 35psi.
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Re: Tire Air Pressure

Post by redhawk » Fri Oct 23, 2009 12:51 pm

I run mine @ 32psi cold.
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Scott Chab
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Re: Tire Air Pressure

Post by Scott Chab » Fri Oct 23, 2009 12:54 pm

32psi cold rear, 34psi cold front.
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02hawk796
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Re: Tire Air Pressure

Post by 02hawk796 » Mon Oct 26, 2009 1:38 am

When I had 275s, I think it was 34 cold. I thought the tires said 44 max. But with 285s for higher speeds, I try 37 cold.
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Scott Chab
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Re: Tire Air Pressure

Post by Scott Chab » Mon Oct 26, 2009 7:09 am

02hawk796 wrote:When I had 275s, I think it was 34 cold. I thought the tires said 44 max. But with 285s for higher speeds, I try 37 cold.
37 is too high (and 44 is WAAAAAY too high). Your tires are going to wear more in the middle, you'll actually reduce the contact patch a little and you'll have a little rougher ride.

It doesn't matter how big the tire is. A 285 doesn't need a higher psi than a 275.
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Re: Tire Air Pressure

Post by BLACK-HAWK » Mon Oct 26, 2009 10:51 am

what's the max P.S.I. recommended on the side wall of the tire?
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Re: Tire Air Pressure

Post by Firehawk » Mon Oct 26, 2009 11:05 am

BLACK-HAWK wrote:what's the max P.S.I. recommended on the side wall of the tire?
Side wall only tells you the max pressure for the tire. You should always look at the sticker in the drivers side door jam that the manufacture put on. When reading sticker make sure it lists the tire size as well as the pressure and that the tire size listed matches what is on the car.

In our case SLP changed the sticker (added a new one) noting the tire size change and a different tire pressure to take into account the tire size change.

My 1995 says 35psi on the sticker.

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02hawk796
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Re: Tire Air Pressure

Post by 02hawk796 » Wed Oct 28, 2009 2:47 am

Always follow the air pressure listed on the door sticker, a good example is Ford listing on their Explorers a low pressure which causes blowouts resulting in fatal accidents - the actual tire pressure was given by the tire mfgr (Firestone), but car makers decide that is too stiff, and they want their ride to be softer without correctly designing their suspension. So you'll know that even if you die, you still followed the tire pressure listing on the sticker. This will save the carmaker's lawsuit load because, of course, you'll be dead.

I have no plans to ride anything over 275 on a stock rim at performance speeds with less than 37psi. And no, the center does not wear faster, but it's only been 5 years tho. You may do as you wish.
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Re: Tire Air Pressure

Post by Scott Chab » Wed Oct 28, 2009 10:13 am

02hawk796 wrote:
I have no plans to ride anything over 275 on a stock rim at performance speeds with less than 37psi. And no, the center does not wear faster, but it's only been 5 years tho. You may do as you wish.
So you set your pressure at 37psi cold? That is going to jump up to over 40psi when they heat up at higher speeds.

It's obviously your call but I would never drive with tire pressure that high.
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Re: Tire Air Pressure

Post by Firehawk » Wed Oct 28, 2009 10:41 am

02hawk796 wrote:Always follow the air pressure listed on the door sticker, a good example is Ford listing on their Explorers a low pressure which causes blowouts resulting in fatal accidents - the actual tire pressure was given by the tire mfgr (Firestone), but car makers decide that is too stiff, and they want their ride to be softer without correctly designing their suspension. So you'll know that even if you die, you still followed the tire pressure listing on the sticker. This will save the carmaker's lawsuit load because, of course, you'll be dead..
I don't buy this. You can't lower the tire pressure enough to make up for a stiff suspension setup.

I due think there was a design flaw in the combination of the tires, rims and the Explorers in general, but I also believe that 90% of the problem was people running on tires that were under inflated. Next time you see one of those older Explorers on the road, look at the tires.

I am weird (but that is besides the point) as I always look at the on tires on cars around me. It seems I can always fine a low tire on the those Explorers.

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Re: Tire Air Pressure

Post by 02hawk796 » Thu Oct 29, 2009 1:01 am

Scott Chab wrote:
02hawk796 wrote:
I have no plans to ride anything over 275 on a stock rim at performance speeds with less than 37psi. And no, the center does not wear faster, but it's only been 5 years tho. You may do as you wish.
So you set your pressure at 37psi cold? That is going to jump up to over 40psi when they heat up at higher speeds.

It's obviously your call but I would never drive with tire pressure that high.
I've checked the pressure after very heavy driving, and have not had the pressure over 40 when hot - very hot.
Like I said, you may do as you wish. If the max pressure is 44 or 50, I much rather have closer to that than too much underpressure.
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Re: Tire Air Pressure

Post by MotleyCrue » Thu Oct 29, 2009 11:48 am

Can anyone post a picture of the door panel sticker? It is hard to figure out. There is a 30/100 on it, then it says 28 psi somewhere...
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Re: Tire Air Pressure

Post by 02hawk796 » Fri Oct 30, 2009 12:40 am

Scott Chab wrote:
02hawk796 wrote:
I have no plans to ride anything over 275 on a stock rim at performance speeds with less than 37psi. And no, the center does not wear faster, but it's only been 5 years tho. You may do as you wish.
So you set your pressure at 37psi cold? That is going to jump up to over 40psi when they heat up at higher speeds.

It's obviously your call but I would never drive with tire pressure that high.
I should have also mentioned, that if somebody is unwilling to inflate to 37psi, they should NOT mount the 285 Firestone Firehawks on the stock rims. Stay with the 275s for sure-footed performance.
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Re: Tire Air Pressure

Post by Scott Chab » Fri Oct 30, 2009 9:05 am

02hawk796 wrote:
Scott Chab wrote:
02hawk796 wrote:
I have no plans to ride anything over 275 on a stock rim at performance speeds with less than 37psi. And no, the center does not wear faster, but it's only been 5 years tho. You may do as you wish.
So you set your pressure at 37psi cold? That is going to jump up to over 40psi when they heat up at higher speeds.

It's obviously your call but I would never drive with tire pressure that high.
I should have also mentioned, that if somebody is unwilling to inflate to 37psi, they should NOT mount the 285 Firestone Firehawks on the stock rims. Stay with the 275s for sure-footed performance.
I guess they shouldn't do what they want?
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