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Old 01-13-2009, 08:17 PM   #1
 
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Default Tire pressure?

I just got a 1999 silverado a couple of months ago. I've never checked the tire pressure till now and I'm not really sure what it should be at.

I was always under the impression that tire pressure was 35 psi for passenger vehicles. So I jump out and look at the tires, there's no reference to tire pressure at all. So I checked the manual and it says to check a sticker on the door. So I check and it says 50 psi!! I find it very hard to believe that all of my tires are 15 lbs under inflated.

My tires do look a little low but i'm thinking that just the cold (-40 here today)
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Old 01-13-2009, 10:57 PM   #2
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I am surprised the tires do not have (in small print) near the wheel what load they will bear under a max tire pressure.

Not only does it depend on the truck, but also on the tire brand and size.

I would suggest doing an internet search.

-Bill



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Old 01-13-2009, 11:16 PM   #3
 
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I know!!! I was surprised as well. I'm going to check it out right now on google.
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Old 01-14-2009, 01:49 AM   #4
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i checked my wife's tires cuz the temp's dropping here in wisconsin.....they were 10 pounds underinflated (they were at 30 instead of 40; i'm not surprised; cold temps f with everything....and i don't think when she gets her oil changed that the grease monkeys ever inflate to max pressure for liability reasons.
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Old 01-14-2009, 08:45 AM   #5
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Quote:
Originally Posted by mblosik View Post
...and i don't think when she gets her oil changed that the grease monkeys ever inflate to max pressure for liability reasons.
Good point. I like to kep my tires a little high - better gas mileage - but when I take the van in for service, it always comes back with tires down to 32.



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Old 01-14-2009, 08:53 AM   #6
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50 psi on an Lt tire does not sound far fetched. My van calls for 45, my car calls for 35 and my off road tires call for a range of 8-65psi. The higher ranges are usually for side wall stability while carrying a load.
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Old 01-14-2009, 09:26 AM   #7
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Is there a reference to the make and size of the tires on the tires?? Is your truck 1500, 2500?? Do you run it heavy or light normally? Normally you would go with what is on your door sticker, Unless you have deviated from the stock size and load range.

Cheers

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Old 01-14-2009, 11:41 AM   #8
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I had Toyo tires put on my Ford 250 Diesel. They were not rated "E". Well they lasted 24k miles. The psi rating was at 40, but the wieght of the truck cause early tread wear. I need Rated "E" that can hold 80 psi. Do yourself a favor and get 10 ply of rated e tires. They will save you in the long run. Over-inflating tires will lead to the center of your tires wearing fast. Under-inflating will lead to the outside edge of the side wall to wear fast. Can't win.
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Old 01-14-2009, 04:08 PM   #9
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I love my Ford diesel
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Old 01-14-2009, 05:29 PM   #10
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Quote:
Originally Posted by premierpainter View Post
Over-inflating tires will lead to the center of your tires wearing fast. Under-inflating will lead to the outside edge of the side wall to wear fast. Can't win.
Ya got that backwards, under will throw the belt outward and allow the tire to "fold up" so centers will wear.
over will wear on the outside of the belt ends because the belt will only stretch out so far but the rest of the tire will still inflate.
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Old 01-14-2009, 07:29 PM   #11
 
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I looked around the net and I couldn't find anything about tire pressure for my truck or tires. I inflated them all to 40 psi and my truck rides much better now.
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Old 01-14-2009, 07:34 PM   #12
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In another life I sold wholesale tires for a while. The Dunlop sales rep told us of a good rule of thumb for everyday tire pressure. Look on the sidewall for the maximum pressure. Take 10% off the maximum and run that. (unless you are hauling maximum weight)
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Old 01-14-2009, 08:46 PM   #13
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Quote:
Originally Posted by bikerboy View Post
In another life I sold wholesale tires for a while. The Dunlop sales rep told us of a good rule of thumb for everyday tire pressure. Look on the sidewall for the maximum pressure. Take 10% off the maximum and run that. (unless you are hauling maximum weight)
Yes, that is to compensate for fluctuating ambient temps. If you fill with nitro you will not have that problem. If you have a locker in your truck equal pressure is needed between all the tires <---very important.

dm26, What tires do you have? make, model and size please.
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Old 01-16-2009, 09:38 AM   #14
 
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I'll check them out tonight when I get home and post it up.
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