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Correct tire pressure for stock 17" ?

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Abacus

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Discussion starter · #1 ·
After taking the vehicle home from the dealer, the EVIC was showing 43/44,
and the max for the tire itself is rated 44psi.
The door says something like mid 30's for proper pressure.

What should it be run at for mostly city / highway driving?
 
#3 ·
The door sticker setting of 34 (35?) is what is recommended by Jeep.

The tire max is for the tire on any vehicle, including a heavier unit that may benefit from a higher psi. Using that on your Patriot will give you a miniscule increase in MPG but will wear the tire a bit faster and will result in noticeably different highway ride and handling.

Take your pressure down to 34 and run it for a few tanks then go back up to say 40 psi and run a few tanks...see what you like better. I see about a 1 mpg difference. That is the range I run...not that the difference is huge but I air up in spring summer and fall but go to 34 in colder, rainy winter.

Just because.
 
#4 ·
I like 35-38lbs in my tires so far depending on the time of year.
 
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#9 ·
My 215/65-17 factory equiped 2011 PAT lists "35PSI Cold" on the door sticker.
 
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#10 ·
Read the tire sidewall - disregard the sticker on the door. The tire will list what the pressure should be.

Image
 
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#12 ·
Is the sidewall maximum pressure for cold or hot tires?

If you inflate the tire to max while cold, then the air temp goes up 30 degrees AND driving increases it even more, the tire will exceed the sidewall maximum and could be dangerous??????

My new 2014 came home last week with the tires inflated to 45 lbs. when COLD. :icon_rolleyes:
 
#13 · (Edited)
croat said:
Read the tire sidewall - disregard the sticker on the door. The tire will list what the pressure should be.

Image
Click to expand...
You're joking right?

Tire Rack said:
A tire's maximum inflation pressure is the highest "cold" inflation pressure that the tire is designed to contain. However the tire's maximum inflation pressure should only be used when called for on the vehicle's tire placard or in the vehicle's owners manual. It is also important to remember that the vehicle's recommended tire inflation pressure is always to be measured and set when the tire is "cold." Cold conditions are defined as early in the morning before the day's ambient temperature, sun's radiant heat or the heat generated while driving have caused the tire pressure to temporarily increase.

For the reasons indicated above, It is also normal to experience "hot" tire pressures that are up to 5 to 6 psi above the tire's recommended "cold" pressure during the day if the vehicle is parked in the sun or has been extensively driven. Therefore, if the vehicle's recommended "cold" inflation pressures correspond with the tire's maximum inflation pressure, it will often appear that too much tire pressure is present. However, this extra "hot" tire pressure is temporary and should NOT be bled off to return the tire pressure to within the maximum inflation pressure value branded on the tire. If the "cold" tire pressure was correctly set initially, the temporary "hot" tire pressure will have returned to the tire's maximum inflation pressure when next measured in "cold" conditions.

A tire's "maximum inflation pressure" may be different that the assigned tire pressure used to rate the tire's "maximum load." For example, while a P-metric sized standard load tire's maximum load is rated at 35 psi, many P-metric sized standard load performance and touring tires are designed to contain up to 44 psi (and are branded on their sidewalls accordingly). This additional range of inflation pressure (in this case, between 36 and 44 psi) has been provided to accommodate any unique handling, high speed and/or rolling resistance requirements determined by the tire and vehicle manufacturers. These unique tire pressures will be identified on the vehicle placard in the vehicle's owner's manual.

The tire's maximum inflation pressure is indicated in relatively small-sized print branded near the tire's bead (adjacent to the wheel) indicating the appropriate value. Because tires are global products, their maximum inflation pressure is branded on the tire in kilopascals (kPa) and pounds per square inch (psi). These values can also be found in the industry's tire load & inflation charts.
Click to expand...
Do the math to figure out where you should be, then do a chalk test to confirm it.

I posted this somewhere before....

1) Find the max load rating and pressure on your tires. Find the weight of your vehicle.
2) Multiply your tire's max load rating by 4
3) Divide the weight of your vehicle by the number found in step 2.
4) Multiply the tire's max load tire pressure by the number found in step 3.

This gets you in a very close ball park. Put your pressure to that number then do the chalk test to determine how well the tire is wearing.

Example....
my new tires are rated at 3,042 lbs at 80 psi cold
My jeep weighs about 4,400 lbs (I forget the exact number, but close enough)

3,042 lbs x 4 tires = a max capacity of the 4 tires of 12,168 lbs

So how much of that max capacity am I using?

4,400 lbs of vehicle weight / 12,168 lbs of capacity = I'm using about 36% of the tire's capacity

80 psi x .36 = recommended tire pressure of 28.8 psi cold.
 
#14 · (Edited)
According to tirerack the stock goodyear sra's have a max load rating of 1,653 lbs at 35 psi. Some random website says the Patriot weighs in at 3,400 lbs.

1653 x 4 = 6,612
3400 / 6612 = 52%
44 x .52 = 23 psi.

That's where I'd start assuming my initial weight, load, and pressure numbers are correct. However I think you'll find the .gov's tire pressure warning light is going to light up around 29 psi. Just a guess. I'm sure it won't be happy with you running 23 psi.







Technically I think P tires with a SL marking have their max load rated at 35 psi, not the traditional max pressure. If I'm correct on that the pressure would be more like 18 - 19 psi cold, but I know already that I'll probably be flamed for my 23 number
 
#15 ·
Hi all!!!

Just my 2¢ .. and you can take it for what it's worth .. I am definitely not an expert on the subject.

I've been following this thread since it started. I recently purchased a 2013 Patriot Latitude 4x4, back in March, with the 17" P215/60R17 BSW All Season Touring Tires. Reading this thread had me curious, so I went outside one morning with my digital tire gauge.

As "Abacus" stated in the beginning of this thread, my pressure from the dealership was also 43/44 PSI. I thought that this was rather high for what I was taught and brought up to know. Working at gas stations part-time for 30+ years, we were told that maximum tire pressure, cold, should be no more than 35 PSI for mostly highway driving .. 32 PSI for combined city and highway.

Given that I started at gas stations part-time back in the mid 70s, I did some research of my own.

Just as "MrMischief" stated in his reply, most tire websites, as well as Jeep themselves, recommends using the posted tire pressure indicated on each vehicles door jam, or located somewhere there about. My previous vehicle stated 32 PSI front and 34 PSI rear. The Patriot states 32 PSI both front and rear, just as "Abacus" stated.

Why the pressure on all four tires was 43/44 PSI from the dealership is beyond me, but I have lowered all my tires to 34 PSI cold and then filled up my gas tank. A 10 PSI difference in tire pressure made a slight difference in my ride .. more towards the more comfortable side, since most of my driving is all highway. Judging by my gas gauge so far, I seem to be getting better gas mileage as well. I'll know better at my next fill-up. My gas mileage at 43/44 PSI ranged around 25.8 mpg.

This thread turned out to be a very interesting one for me!:icon_rolleyes:
 
#17 ·
my door sticker says 35psi cold.
that's what i use,even with my 245/65/17.
the tire shop always said to stick to the manufacturer's recommendation.
even with bigger tires,pressure should be the same.it's just more air volume on the inside than with stock.
 
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#18 · (Edited)
With bigger tires you tend to get a higher load capacity. Running it at the same psi as a tire with a lower load rating may cause the tread to not sit flat on the pavement. Having less tread on the ground should increase your gas milage, but increases wear and decreases traction.

To each their own. I'm sticking with math and chalk. I like my tread pattern square on the ground at the minimum pressure to increase my comfiness
 
#19 ·
MPG Update ..

just filled the tank and calculations reads 26.1 mpg .. could be the warmer weather though. don't know why, but as the weather gets warmer, i've always gotten better gas mileage, so i cannot truly attribute this to the tire pressure change.
 
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