- Thread starter ldj
- Start date
Since the tire label is accurate for that specific tire while the door label is more for perhaps??? the tires the car was originally shipped with, ID USE THE TIRE MAKERS RECOMMENDATIONS INSTEAD OF ANY LABEL ON THE CAR.
Often you see max load at X PSI labeled on a tire and in my RV or heavy trucks where I haul maybe the max rated load I AIR THE TIRES TO THAT MAX LOAD AT PSI PRESSURE. In a passenger car where you're light loaded and at less then the tires rated capacity some people run lower pressure for a softer ride HOWEVER I DONT I usually use closer to the max load at X PSI rating especially on whatever axle the most weight is.
I feel safer if aired to the max load at X PSI versus less air pressure. In my opinion an underinflated tire heats up more due to the friction of the sidewalls constantly flexing so I choose to err on the side of too much air (still no more then recommended) versus too little air
That's my story n Ima stickin to it
John T NOT a tire expert
Often you see max load at X PSI labeled on a tire and in my RV or heavy trucks where I haul maybe the max rated load I AIR THE TIRES TO THAT MAX LOAD AT PSI PRESSURE. In a passenger car where you're light loaded and at less then the tires rated capacity some people run lower pressure for a softer ride HOWEVER I DONT I usually use closer to the max load at X PSI rating especially on whatever axle the most weight is.
I feel safer if aired to the max load at X PSI versus less air pressure. In my opinion an underinflated tire heats up more due to the friction of the sidewalls constantly flexing so I choose to err on the side of too much air (still no more then recommended) versus too little air
That's my story n Ima stickin to it
John T NOT a tire expert
Russ from MN
Well-known Member
- Location
- Bemidji MN
The pressure rating on the tire is for the maximum load on the tire, which you should not have. The pressure rating on the door post is for the best ride at average conditions. I always go somewhere in between.
ljd we could use a little more information here. What make, style, and other information can you give us about the tires on the car? are the tires you have extra load tires. What make and model car? I'm guessing at 32 lbs on the door you have a sedan of some sort. Is this a retired police car? Probably not if there is a 32 lb recomendation on the door. 32 lbs is the auto MFG recommendation, your tires are designed so they can run up to 44 lbs, are you going to load the car real heavy? If not heavy loaded you most likely can get by with 35 lbs. If you run much more than that for extended lengths of time you will most likely have premature tire wear in the center of the tires.
Indiana Ken
Well-known Member
I recently changed tires on my van. The new tires state on the sidewall; max load 2149 lbs at 50 psi max pressure. Also, written on the sidewall is; follow owners manual or vehicle placard for proper inflation pressure. The inflation pressure listed on the vehicle door jam is; 41 psi.
Since my replacement tires are the same size (different brand) as the OEM tires, I inflate to 41 psi for normal service. Typically the pressure listed on the tire sidewall is the max pressure for use with max load/speed service.
As long as the tires are the size/type specified on the label that gives you the pressure, I would use that pressure. Tire wear will be even and traction best. If you inflate to the max pressure on the tire, it is possible to cause excessive wear to the center of the tread and also reduce pavement contact area.
Now, if the tires are no the size/type specified, talk to a good tire shop. For a passenger car I cannot see ever inflating to the max pressure listed on the tire.
I have always inflated to the manufacturers specified pressure and have always got long tread life out of tires, both bias ply and radial. Some cars have different pressures for front and rear, so remember that when rotating tires.
Josh
Now, if the tires are no the size/type specified, talk to a good tire shop. For a passenger car I cannot see ever inflating to the max pressure listed on the tire.
I have always inflated to the manufacturers specified pressure and have always got long tread life out of tires, both bias ply and radial. Some cars have different pressures for front and rear, so remember that when rotating tires.
Josh
dr sportster
Well-known Member
If the label on the door has to be read when the door is open then that is the proper pressure for driving with the car door open. If the door is closed then you use the ratings on the tire. Pretty sure about that.
my pickup tires specify 65 psi at rated load--which i use when heavily loaded. But in the past when i left that pressure in lightly loaded over the hot summer the steel belts have broken on 4 pickup tires and 2 trailer tires. I now reduce the pressure at least 25% for when lightly loaded
jimg.allentown
Well-known Member
"Any tire shop would tell you 32 psi. for normal use"
And any tire shop would be WRONG!!!! The tire pressure listed on the door or on a sticker in the glovebox or elsewhere on the car indicates the OPTIMAL pressure for all around usage. This takes into account ride, handling, comfort, safety, and weight loading.
Contrary to popular myths, manufacturers want you to be SATISFIED with the product that you have purchased. There is no such thing as a "universal" tire pressure.
And any tire shop would be WRONG!!!! The tire pressure listed on the door or on a sticker in the glovebox or elsewhere on the car indicates the OPTIMAL pressure for all around usage. This takes into account ride, handling, comfort, safety, and weight loading.
Contrary to popular myths, manufacturers want you to be SATISFIED with the product that you have purchased. There is no such thing as a "universal" tire pressure.
Determined
Well-known Member
Vehicle manufacturers determine what pressure is best for the weight and suspension of the vehicle, based on normal usage.
Think back to the days of bias ply tires and manual steering,
a couple of psi made all the difference in how the car would steer and handle, so yes the manufacturers know what they are talking about when they state what pressure to set your tires at.
Assuming you are using the same size and ply rating as original I would go with the door sticker, as long as you are not exceeding the rating on the tire.
Hook on a travel trailer or put four or five large people in for a long trip and you will want to air up to compensate, possibly up to the maximum rating of the tire.
Heavier vehicles you will adjust pressure according to the load.
If I drive my 1-ton empty with 85 psi in the tires it is like riding on steel wheels.
If I tow 15 000 lbs with 35 psi in the tires they will quickly build heat until they let go.
Low speed off road some will air down to 10 psi for better traction and ride.
Lots of variables to consider.
Dave
Think back to the days of bias ply tires and manual steering,
a couple of psi made all the difference in how the car would steer and handle, so yes the manufacturers know what they are talking about when they state what pressure to set your tires at.
Assuming you are using the same size and ply rating as original I would go with the door sticker, as long as you are not exceeding the rating on the tire.
Hook on a travel trailer or put four or five large people in for a long trip and you will want to air up to compensate, possibly up to the maximum rating of the tire.
Heavier vehicles you will adjust pressure according to the load.
If I drive my 1-ton empty with 85 psi in the tires it is like riding on steel wheels.
If I tow 15 000 lbs with 35 psi in the tires they will quickly build heat until they let go.
Low speed off road some will air down to 10 psi for better traction and ride.
Lots of variables to consider.
Dave
Bought new tires for the wifes car a few years ago and wandered the same thing. Called Tire guy I bought them from and asked him. He said always go by the door label. (He has been in the tire business for 30+ yrs and sells and services tires for everything for cars, semis to tractors)
Bought new tires for the wifes car a few years ago and wandered the same thing. Called Tire guy I bought them from and asked him. He said always go by the door label. (He has been in the tire business for 30+ yrs and sells and services tires for everything for cars, semis to tractors)
He is talking of a 02 Ford Crown Vic and tire shop will set it to 32 lbs. as stated on door sticker or spec sheet. If that Crown Vic has tire pressure sensors I think they are set at 32 lbs. If you are going to carry max weight of car or pull trailer they will up pressure to the max.
T in NE
Well-known Member
- Location
- Cambridge, Nebraska
The door sticker on my truck (if it were still there) would say front tires to 65 PSI, rear to 80. I will tell you right now that anything over 55 in the rears while empty is a good way to go out and kill yourself. Every tire shop I have been in has tried killing me even when I wrote down the pressure I wanted in them.
What I do to get my proper rear tire inflation is do a burn-out and look at my tracks. If it's darker in the middle, need less air, darker on the edges, need more air.
Heavy truck tire manufacturers should provide tables for proper inflation for the load being carried on the tires. A Century Class with 40,000# drives and metric tires will say "at 105 PSI", but you check the tires, and that's enough air to carry 46,000 pounds, and you're only carrying 34,000. I think the local tire shops here like to replace good tires that have the tread burnt off them from the tires flexing like a steel wheel over our gravel and busted-up paved roads.
What I do to get my proper rear tire inflation is do a burn-out and look at my tracks. If it's darker in the middle, need less air, darker on the edges, need more air.
Heavy truck tire manufacturers should provide tables for proper inflation for the load being carried on the tires. A Century Class with 40,000# drives and metric tires will say "at 105 PSI", but you check the tires, and that's enough air to carry 46,000 pounds, and you're only carrying 34,000. I think the local tire shops here like to replace good tires that have the tread burnt off them from the tires flexing like a steel wheel over our gravel and busted-up paved roads.
Phil9N3667
Well-known Member
And when you check your pressures monthly, find your spare and check it too!! A flat spare is no better than the one on the ground flat.
the tire pressure inside the door jamb of the vehicle is calculated for best ride and stability/handling in normal driving conditions. It is safest to follow this rating for best/safest operation on your vehicle.
The pressure listed on the tire is the maximum safe pressure for that tire.
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