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PU truck tire pressure

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Ken in Mich

02-12-2006 10:41:49

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I had new tires put on my '98 Chev 1/2 ton Z71 pickup. I checked the pressure and only had 35psi in them and the tire sidewall sezs Max65psi. I called the tire dealer and they told me you go by the sticker inside the door, not whats on the tire sidewall. Sure enough the sticker says 35psi... I'm planning a trip and wondering if this is the right way to go, with the price of gas would I be losing MPG?
I've always put the max pressure in the past, have I been doing it wrong all these years? 35psi in a 65psi tire just doesnt make sense to me.

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John M

02-13-2006 03:05:55

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

Had the same truck,ran 45 in them,35 seemed to eat the outside edges up pretty quick.These were on Bridgstones Duellers.Second set got me about 57000 out of them running at 45.

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Leland

02-12-2006 20:52:39

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

Wife had a new grand am and the tire said 50 lbs but sticker said 32psi , if you blew those tires up that tight you could not stand the ride .

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sjh

02-12-2006 17:59:33

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

The car manufactures test the air pressure and probaly set it for max comfert. Remember the ford suv roll over problem. Part of the cause was ford verse tire maker air pressure. I run 65 front 75 rear on my 1 ton single wheel chevy. One other thing was the gas milege. You want your tire riding in the center of the tread not the out side.

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RodInNS

02-12-2006 17:35:47

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

Tire pressure is an entirely variable figure. It depends upon how much weight the tire is carrying. The basic idea is that the more load the tire is carrying, the more pressure it needs to carry the load. If it's not aired up enough, then the tire squats too much, and then the sidewalls flex too much, and ruin the tire. The particular LT tire you have will have a maximum load rating at 65 PSI. You can run any value up to 65 PSI, provided it's correct for the load you're carrying. Simply put, follow the pressure recomendation on the truck, according to the load you're carrying.

Rod

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Oliver Power

02-12-2006 16:16:18

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

My truck has 265-75R-16. I run 40 pounds loaded or not. 99% of the time I"m loaded.

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scotc

02-12-2006 16:09:19

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

there"s another way to check inflation. do a burnout and look at your tracks. I"m running 42 front and 25 rear on my 01 ram 1500, still a litle light on the edges of the rear tires but i"m not running any less psi. 235/86r16E house brand tires.

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Bernie in MA

02-12-2006 15:52:59

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

I was driving my wife"s Ford Escort for a while and aired the tires to what it said on the tires. When the garage did the oil change they let "em back down to the Ford rec level and I lost 2 MPG, almost 10% of previous MPG.

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doogdoog

02-12-2006 14:51:56

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

Aloha, I would measure the cold tire pressure and fill about 5 lbs less, thinking that when the air gets hot, it will expand and go over the max pressure. Too much pressure and the ride gets bumpy (except when you have a load) and not enough,it ruins the tire. 35lbs without a load seems like a good pressure and gives a smoother ride. I have a lot of friends that runs their truck with tire pressures between the minimun and maximum without any problems. Mahalo,
doogdoog

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RAB

02-12-2006 14:17:46

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

Ken,
Do you always run your truck at MAX speed?
Do you always go to MAX revs in every gear?
Do you always run your engine with the oil level at MAX?
Max is what it says. You should under no circumstances exceed that value, but for an awful lot of the time you do not need to operate any where near to the max.
Sure, if you put on 12 ply rated tyres it might say 120psi max and carry about 4 tonnes on each tyre at max speed of 30mph.
Same tyres are used on lots of different vehicles, not suprising vehicle manufacturers know what is best for their vehicle. Stick to their recommendations.
RAB

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Jon Hagen

02-12-2006 13:00:20

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

The information on the tire states that this tire will carry XXXXX pounds of weight at XX psi of air pressure. If you have less than maximum weight on the tire,then it needs less psi pressure to evenly load the tire face for even wear. Go by what the pickup maker recommends,or weigh your pickup,front then rear and set tire pressure according to the chart the tire draler will have for that size tire for a given weight,or the pickup operators manual.

I ran into that deal with my old motor home,the guy at the tire shop said it says 100 psi on the tire,so by gosh you gotta run that much. at 100 psi the old motor home rode so rough that we had screws rolling around on the floor after a 1000 miles on the road. I dug through the operators manual which had a tire weight/size/pressure chart. We stopped at a fertilizer plant in Kansas and used their scale to get the loaded front/rear weight of that old Pace Arrow. Turns out that we were far under the max load that would require 100 psi tire pressure. We needed 45 psi in the rear duals and 55 psi in the front. After that the motorhome rode like a cadillac instead of an old 6X6 army truck.

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John A.

02-12-2006 12:39:53

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

Ken, For more than 20 yrs now I have had 3/4s and heavy 1/2s, 4x4, under me. I have always aired down to 35 lbs when not trailering or carring big loads. Then air up to 65 when need. I have gottened as much as 55 to 65 K miles out of each set as a rule. On your 1/2 ton, 4x4 chevy i see now problem running 35 lbs while bobtailing around in no or light load situations. I have been doing it for 20+ yrs now.
i currently have a set of 265/75R-16, load range Es. Best tires I have ever had to date. On my 97 F-150, 4x4, long box. Old girl had 302k miles on her now. I put on average 40 k miles/yr.
Later,
John A.

OBTW...Check air pressures regulary! So you don't run one low, and ruin a tire.

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vrickster

02-12-2006 12:06:40

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

I had just the opposite happen to me! New tires and the guy put in the max 65psi. My pu truck was all over the road, hard to handle at highway speeds, overly responsive in the steering wheel. I lowered the pressure down to what is says on the door (35) and the handling went back to normal. I think increasing the tire pressure makes sense IF you are increasing the load that the truck is carrying.

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old

02-12-2006 11:47:01

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Re: PU truck tire pressure in reply to Ken in Mich, 02-12-2006 10:41:49

Well unless things have changed since I was in the tire bus. you should run them at or close to what the tire says. But that was also 20 plus years ago whne I was doing tire repair and selling tires, but I don't think thing have changed. We always aired them up to what the tire said they should be

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