Tire pressure

CertusExpo · Dec 27, 2018

I was curious and decided to search on the topic and here I am.

Running 75# currently at all four corners. Almost at wear indicators.

TobyU · Dec 27, 2018

I don't care what any door sticker or owners manual says. I put 35 in a 35 psi max tire and 40-41 in a 44 psi max tire and at least 70 in a 10 ply 80 psi max tire.
Manufacturers are not as smart (or give best info)as some people claim them to be.
Now I have been doing this since way before....but remember fords recommended pressures and the Explorers. Had I of had a explorer with firestone tires, I would have had no issues with the air I would have run in them

08T1 · Jan 1, 2019

I don’t care what Ford says. I’m not running their tires. I’m running 65# cause it’s what my tires are rated for. I am very happy with there wear and performance.

If you change from stock tires the door sticker is useless.

JMHO.
CJ

TobyU · Jan 1, 2019

08T1 said:
I don’t care what Ford says. I’m not running their tires. I’m running 65# cause it’s what my tires are rated for. I am very happy with there wear and performance.

If you change from stock tires the door sticker is useless.

JMHO.
CJ

Correct.
Always check the tires though because you would never want to put that much pressure in a tire rated for 35 maximum.
I often don't fill the tires up all the way to the maximum inflation except for the ones that are 35. I always put 35 and 35 max PSI Tire.

People must remember that the manufacturers often do not have the same goals in mind as the end-user or the owner of the vehicle.

CertusExpo · Jan 1, 2019

08T1 said:
If you change from stock tires the door sticker is useless.

Absolutely.
And don't forget the high pressure stems!

Speaking of tires. Anyone run Cooper S/T MAXXs?

08T1 · Jan 2, 2019

You both are correct. Don’t over inflate tires too.

CJ

1997SCEBFEX · Jan 2, 2019

35X4; spare kept higher due to infrequency of use.

Plati · Jan 2, 2019

There was a thread on this last year (or so). I seem to recall that if you're running Light Truck tires (10 ply, rated up to 80 psi) like I am, you need to calculate or measure the appropriate pressure to use? Somebody had a chart from the Tire & Rim Association to calculate. There is also the chalk method, which displays tread contact with the pavement.

You dont want to just fill to max pressure I thought. Tire pressure should match the weight carried, more weight = more pressure? Thats the idea with those tires, as weight carried increases ... the tire pressure is increased to compensate. The tires have beefy sidewalls to be able to handle that. If you have a "normal" load on the tire and crank it up to max psi that isnt good?

1955moose · Jan 2, 2019

Heat is the biggest enemy on an under inflated tire. More tire catastrophes happen with a tire or tires that are run too long without sufficient air pressure. Over inflating is also bad, due to side walls being stressed. A good rule of thumb, that I've always followed was inflate car tires at about 70 percent of maximum side wall total. My kumho street tires give a Max of 49, I run about 41-42 psi. When hauling a heavy load such as a camper or such, that pressure would increase to 80-85 percent. This is my personal situation, I'm sure tire manufactures recommend different.

Sent from my N9131 using Tapatalk

TobyU · Jan 2, 2019

MrSticker said:
There was a thread on this last year (or so). I seem to recall that if you're running Light Truck tires (10 ply, rated up to 80 psi) like I am, you need to calculate or measure the appropriate pressure to use? Somebody had a chart from the Tire & Rim Association to calculate. There is also the chalk method, which displays tread contact with the pavement.

You dont want to just fill to max pressure I thought. Tire pressure should match the weight carried, more weight = more pressure? Thats the idea with those tires, as weight carried increases ... the tire pressure is increased to compensate. The tires have beefy sidewalls to be able to handle that. If you have a "normal" load on the tire and crank it up to max psi that isnt good?

You are correct but this is more of an issue on 10 ply 80 psi tires that sometimes people will put on a normal vehicle that doesn't really carry any weight. On some of my larger vehicles that do carry some weight I've only gone to 70 or 72 as I've never been at the limit of what the tires can handle according to what stamp on the sidewal weight wise.
It seems that most tires either say 35, 44, 51, or 80.
I always put 34 to 35 in a 35 tire and they have always worn nicely. I find the if you put 44 or 51 in those marked tires they can often be a little over inflated and you can get increase center wear. This is where the chalk method mentioned can come in handy.
I would much rather have my tires at 35 PSI on a 35 max marked Tire than to risk them being down at 26 or 28 and starting to get low and being severely under-inflated.

Tire pressure

CertusExpo

Customizing trucks since I was 7 with my Legos

TobyU

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08T1

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TobyU

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CertusExpo

Customizing trucks since I was 7 with my Legos

08T1

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1997SCEBFEX

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Plati

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1955moose

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TobyU

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