More is not always better. My 08 Chevy truck calls for 35, but I run 30psi in town on bumpy roads, which is 90% of the time. I love the smooth ride. A heavier Tahoe spec is 30psi. Of course, if I am hauling something really heavy, or on a highway trip, I just bump them up for the conditions. Of course I am OCD, and use only nitrogen too. Tires are load rated for 35psi, which they should be stamped as for max pressure, unless more is required! It only confuses people. I checked tire pressure in someone's VW bug with "evenly worn tires", that thought it drove fine. It had 95psi in the RF, and 7psi in the LR!
Do you inflate by manual specs or tire specs?
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I typically run (fwd/awd) 34-35 front, and 32-33 rear. This does not include full size SUV's or pickups. I tweak pressure for even tread wear.
Originally Posted By: Gillsy
I typically run (fwd/awd) 34-35 front, and 32-33 rear. This does not include full size SUV's or pickups. I tweak pressure for even tread wear.
But the point of this thread is what your tire spec (door jam placard or owner's manual) tell you to do? For example, BMW a few years ago had people inflating the front tires to 31 psi, and the back tires to 36 psi, yet I wonder how many people did what the BMW engineers said to do?
I typically run (fwd/awd) 34-35 front, and 32-33 rear. This does not include full size SUV's or pickups. I tweak pressure for even tread wear.
But the point of this thread is what your tire spec (door jam placard or owner's manual) tell you to do? For example, BMW a few years ago had people inflating the front tires to 31 psi, and the back tires to 36 psi, yet I wonder how many people did what the BMW engineers said to do?
Originally Posted By: ExMachina
For example, BMW a few years ago had people inflating the front tires to 31 psi, and the back tires to 36 psi, yet I wonder how many people did what the BMW engineers said to do?
Mine calls for 29 PSI front / 33 PSI rear, and that's what I do.
For example, BMW a few years ago had people inflating the front tires to 31 psi, and the back tires to 36 psi, yet I wonder how many people did what the BMW engineers said to do?
Mine calls for 29 PSI front / 33 PSI rear, and that's what I do.
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Originally Posted By: ExMachina
Originally Posted By: Gillsy
I typically run (fwd/awd) 34-35 front, and 32-33 rear. This does not include full size SUV's or pickups. I tweak pressure for even tread wear.
But the point of this thread is what your tire spec (door jam placard or owner's manual) tell you to do? For example, BMW a few years ago had people inflating the front tires to 31 psi, and the back tires to 36 psi, yet I wonder how many people did what the BMW engineers said to do?
I do exactly what BMW engineers say to do with respect to tire pressure because that's what the car was designed and tested with.....
Of course I follow the European recommendations not the American ones, as they give leeway for how the car is loaded, the NA-spec does not.
Originally Posted By: Gillsy
I typically run (fwd/awd) 34-35 front, and 32-33 rear. This does not include full size SUV's or pickups. I tweak pressure for even tread wear.
But the point of this thread is what your tire spec (door jam placard or owner's manual) tell you to do? For example, BMW a few years ago had people inflating the front tires to 31 psi, and the back tires to 36 psi, yet I wonder how many people did what the BMW engineers said to do?
I do exactly what BMW engineers say to do with respect to tire pressure because that's what the car was designed and tested with.....
Of course I follow the European recommendations not the American ones, as they give leeway for how the car is loaded, the NA-spec does not.
I go with 3-5 psi above the door sticker, BUT unless you driving a truck and upgrade to LT tires, you should throw away the door sticker and convert your regular tires to LT rate tires, for example ( CORRECT ME IF IM WRONG ), if your truck came with regular tire 35PSI on door sticker ( 44 max psi ), if you upgrade to LT rating tires ( max psi 80 ) then 60psi LT tires is equal to 35psi regular tires. or something like that, all I know LT tires take alot more pressure.
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Originally Posted By: ExMachina
MetalSlug, sounds like a TireRack.com question over the phone. I've never heard of that equivalency, yet makes sense.
one of my old expedition the preview owner install LT rating tires ( max 80 psi say on tires wall ), I dint know I just follow what my door sticker 35psi, til one day I take my expedition in for inspection, the guy say im running to low on my tires, I know I put 35 psi like the door sticker say, he say since im having LT rating tires, I should add more pressure, he put 60 psi , he say running 55-60psi for daily drive, and if im towing heavy load, I should add more psi. I havent drive the expedition in a very long time, so I dont know any pro and con about that. all I learn was LT tires need more pressure then regular tires.
I think I did ask that question about LT rating psi on here, and some one say if my truck sticker say 35 psi, then I should put 55-60 psi to kinda equal out.
MetalSlug, sounds like a TireRack.com question over the phone. I've never heard of that equivalency, yet makes sense.
one of my old expedition the preview owner install LT rating tires ( max 80 psi say on tires wall ), I dint know I just follow what my door sticker 35psi, til one day I take my expedition in for inspection, the guy say im running to low on my tires, I know I put 35 psi like the door sticker say, he say since im having LT rating tires, I should add more pressure, he put 60 psi , he say running 55-60psi for daily drive, and if im towing heavy load, I should add more psi. I havent drive the expedition in a very long time, so I dont know any pro and con about that. all I learn was LT tires need more pressure then regular tires.
I think I did ask that question about LT rating psi on here, and some one say if my truck sticker say 35 psi, then I should put 55-60 psi to kinda equal out.
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Originally Posted By: Quattro Pete
Originally Posted By: ExMachina
For Hypermiling, you can inflate to the tire sidewall max psi. People did that a lot back in 2008 when gas prices spiked during the summer.
So you save a little on gasoline, and then spend more on suspension fixing. Do you still come out ahead in the end?
Other than possible suspension failed sooner, performance/handling is totally screwed.
Saving few dollars per thousand miles is not worth the risk of an accident with max pressure.
Originally Posted By: ExMachina
For Hypermiling, you can inflate to the tire sidewall max psi. People did that a lot back in 2008 when gas prices spiked during the summer.
So you save a little on gasoline, and then spend more on suspension fixing. Do you still come out ahead in the end?
Other than possible suspension failed sooner, performance/handling is totally screwed.
Saving few dollars per thousand miles is not worth the risk of an accident with max pressure.
I would never have ball to running the MAX PSI on tire wall, cause when tires hot, it get more pressure, if you running max psi ( say 44 ), when hot it can run to 49-50 psi, that way pass the tires max psi.
Originally Posted By: MetalSlug
I would never have ball to running the MAX PSI on tire wall, cause when tires hot, it get more pressure, if you running max psi ( say 44 ), when hot it can run to 49-50 psi, that way pass the tires max psi.
A tires max psi on the sidewall is the max psi COLD. Yes they will increase as temp increases but that is what they are designed to do.
I would never have ball to running the MAX PSI on tire wall, cause when tires hot, it get more pressure, if you running max psi ( say 44 ), when hot it can run to 49-50 psi, that way pass the tires max psi.
A tires max psi on the sidewall is the max psi COLD. Yes they will increase as temp increases but that is what they are designed to do.
Originally Posted By: Nate1979
Originally Posted By: MetalSlug
I would never have ball to running the MAX PSI on tire wall, cause when tires hot, it get more pressure, if you running max psi ( say 44 ), when hot it can run to 49-50 psi, that way pass the tires max psi.
A tires max psi on the sidewall is the max psi COLD. Yes they will increase as temp increases but that is what they are designed to do.
so how you know the max psi when hot, to prevent blow out ? that crazy some follow that max psi on tires wall.
Originally Posted By: MetalSlug
I would never have ball to running the MAX PSI on tire wall, cause when tires hot, it get more pressure, if you running max psi ( say 44 ), when hot it can run to 49-50 psi, that way pass the tires max psi.
A tires max psi on the sidewall is the max psi COLD. Yes they will increase as temp increases but that is what they are designed to do.
so how you know the max psi when hot, to prevent blow out ? that crazy some follow that max psi on tires wall.
Originally Posted By: MetalSlug
so how you know the max psi when hot, to prevent blow out ?
It does not matter. A tire is engineered to actually support pressure in excess of max cold PSI, specifically because the tire manufacturer knows that PSI will increase as the tire warms up.
As long as you don't exceed max cold PSI, you don't need to worry about a blow out.
so how you know the max psi when hot, to prevent blow out ?
It does not matter. A tire is engineered to actually support pressure in excess of max cold PSI, specifically because the tire manufacturer knows that PSI will increase as the tire warms up.
As long as you don't exceed max cold PSI, you don't need to worry about a blow out.
Originally Posted By: totegoat
Tires achieve their highest weight carrying capacity at maximum psi.
Not necessarily. Take, for example, this E-Rated LT tire:
It really is a case by case situation. Blanket statements about tire pressures are rarely correct.
HTH
Tires achieve their highest weight carrying capacity at maximum psi.
Not necessarily. Take, for example, this E-Rated LT tire:
It really is a case by case situation. Blanket statements about tire pressures are rarely correct.
HTH
Originally Posted By: totegoat
Tires achieve their highest weight carrying capacity at maximum psi.
That is often not the case...
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=195
Tires achieve their highest weight carrying capacity at maximum psi.
That is often not the case...
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=195
Originally Posted By: Quattro Pete
Originally Posted By: totegoat
Tires achieve their highest weight carrying capacity at maximum psi.
That is often not the case...
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=195
And I drive a car, not an earth mover.
Originally Posted By: totegoat
Tires achieve their highest weight carrying capacity at maximum psi.
That is often not the case...
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=195
And I drive a car, not an earth mover.
I have always filled my tires up according to the sidewall PSI. I have about 70k on my Goodyear Duratracs with no uneven tread wear whatsoever. In fact, people dont believe me when I say I have 70k on them. Good tire in just about anything, but they are LOUD! Goodyear Silent Armors for me next time..
I will have to see how the door jamb compares to the current 31's as well as the original Goodyear spare, which is what I assume came on the Jeep from the factory.
I will have to see how the door jamb compares to the current 31's as well as the original Goodyear spare, which is what I assume came on the Jeep from the factory.
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