I run 40# all the way around cold.

IndyDurango

 

I think you're seeing the max tire pressure on the sidewall of the tire, that would be 50 psi.

I've run 35 psi all around for a bit softer ride, 40 is fine, probably gives better mileage and tire life. The 35 front 41 rear is the same as listed on my door (maybe on all D's??) but I usually run the same pressure all around. In any case don't run 50, that's way too high, I'd run 40 as the max.

 

31x10.50's are what I got. I assume you have the same also. during winter/cold months I stay at 40psi. during the warmth months. I'm running 50psi. rides smooth and I've gotten my best mpg following the manufacturers specs on the side of the tire.

 

Running the max tire pressure you're probably seeing the center of the tire wear out rather quickly. That pressure is designed for maximum weight loading of the vehicle. If you want the absolute maximum tread pattern on the road, try the following:
Go out to a large parking lot with lots of room.
Have a good supply of water, like a 5 gallon bottle of water.
Pour a good strip of water across your path.
Measure your tire pressure.
Drive through the water a go far enough to leave a good water print of your tread.
Check the print to see if the edges or the center are darker. Center may not really leave any water if pressure is too low.
Increase pressure if center is too light, decrease pressure if edges aren't showing well.

Be sure to do this with the tires hot.

Otherwise, run them at about 35 for good life and even wear.

 

The 50 psi you read on the sidewall is the MAXIMUM tire pressure, not the recommendation. There's no reason you should ride that high - you'll see unusual wear in the center of the tread and a stiffer ride.
The 41 Rear/35 Front is for heavy duty service - towing, heavy loads, etc. You'll find the recommended pressure for normal service is 30/30 I believe, but most folks here think that's too soft.
I run 35-36 psi all around except when towing when I push it to 36 Front/41 Rear.
Make sure you check and adjust pressures when the tires are cold, even a few miles can heat the tires and increase the pressure. I've even seen differences between the sunny and shady side of the D in mid-summer. Also, coming out of winter, be sure to check and adjust pressures frequently - you'll see a 1 psi change for each 10 F temp change.

Joe

 

id say go with what's on the tire. if its written on the tire, then that's what it says? I'd even fill it up to to 53 for better mpg?



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Midnite you never go by what the tire says. The # on the tire is the pressure at the max Payload listed on tires.
If I did that with My D Rated Tires I'd have 55-65lbs of air in my tires, I may as well drive a POGO STick!
It's best to use the test method Mike gives above if using different than OEM Tires. If OEM are used stay close to Door LAbel
Steve
DOC Pres

 

If you fill with 50 cold you'll have 55-56 hot after they heat up. Do that on a 90 degree summer day and you're looking for some tire problems. Just my opinion, I'm not a tire expert, but I'd keep it lower.

 

Probably Why you blow out tires all the time Midnite!!
They're like rocks!
Steve
DOC Pres

 

id say go with what's on the tire. if its written on the tire, then that's what it says? I'd even fill it up to to 53 for better mpg?

Man that's WRONG information! You need to understand what the the numbers represent. http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=21

1. You always are supposed to chech the pressure when cold. Even driving 1/4 mile can raise the pressure. Check is prior to heading to a station, then add the number of pounds when you get there that were needed when cold.

2. Check them several times a year as the seasons change.

 

SEE POST ABOVE!!
Seriously Midnite what are you running those tires you have at?
Steve
DOC Pres

 

the 35/41 psi front/rear are for the stocker 15-in wheel that's standard. The 16-in tire options (my 255/65/16)
require less pressure at 30/35 psi front/rear but even this is for "Heavy Duty" Use as specified in the tire pressure manual that came with the Owner's Manual. Heavy Duty is if your towing or carrying more than 200lb and/or more than 2 people.

I have 35/41 on my door sticker but typically run close to 30 all the way around. Occasionally I'll make 35 in the rear. The max tire pressure on the sidewall is a MAX not to be exceeded. For high speed driving I have read to add 10# (10# SUV-Lt Trucks, 3-4# for pass cars) over specified cold inflation pressure NOT to exceed the MAX on the tire.

 

For high speed driving I have read to add 10# (10# SUV-Lt Trucks, 3-4# for pass cars) over specified cold inflation pressure

Hey Midnite, based on your recent high speed run with the Viper, you ought to be running 70 psi! Just kidding!

I've run under 35 psi on other cars over the years but with these tires 35 is about as soft as I want to go, I had them too low once last fall and could feel it right away, felt like it was over-steering in corners. These seem to want the pressure, not sure if its a normal trait of lower profile tires or not, I've never run 60 series before on an SUV.

David

 

You should be running a PSI that's works for the load you're carrying. For my D I ran 35 in front and 32-33 in back most of the time. If we were loading it up for a trip then I'd add a little to the rear tires.

With the Ram during the winter with 1,000 pounds hanging off the front and usually 2,000 pounds of salt in the bed I run my tires at 80 PSI.

This post is reminding me it's time to check the tires and soften them up a bit now that plowing is done.

 

SEE POST ABOVE!!
Seriously Midnite what are you running those tires you have at?
Steve
DOC Pres

the pressure on the tire says 50 psi max. I fil it to 50-53 when its cold?



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WAy too High of Pressure.
Steve
DOC Pres

 

I don't know where this crap comes from? I've heard many mechanics recommend inflating tires to the sidewall pressure, and that's just plain stupid.

The sidewall pressure is the pressure to use when the tire is carrying maximum (static) load. The front tires of your D will never, ever, see their rated static load (ahd it's pretty unlikely that the rears will either).

The recommended pressure from the door sticker is based on the actual loads the tire will see (that's why there are often several different pressures for different conditions)?

50PSI on a gen-1 D is gonna make for a bouncy ride and pretty scary (if not downright fatal) braking? Don't do it.

?tom

 

I'm still running the stocker badyears, however, next year will be running the Dueller A/T Revos. I run 35 psi all the way around.

Joe

 

follow the door label?or within reason of the label

I don't wanna rag on you midnight?but expescially with your speeding I'd let some air out on your tires?I'd hate to come on here one day and one of the members here was killed in an avoidable roll over

 

SEE POST ABOVE!!
Seriously Midnite what are you running those tires you have at?
Steve
DOC Pres

the pressure on the tire says 50 psi max. I fil it to 50-53 when its cold?

Hey midnite if they say "50 psi MAX" what would be your reasoning to fill it up to 53 psi? When it's hot out the PSI would be way over 53!

 

hmm. maybe I need to do that water thing test to get my pressure right. I always thought my tires wearing out was from driving gravel roads and through fields combinded with my lead foot?well those don't help? :cheesy:

 

You can also use a piece of sidewalk Chalk. Color a line acroos tread of tire then drive a bit and if Cahalk is off on outsides only tire is underinflated if it wears center only overinflated.
We used to have to do this on our really large trucks with 36 " + Tires that way we ended up with right pressures.
For the record my fullsize Cheby Monster Truck with Swampers ran 28 psi and chalk wore evenly off tread
Steve
DOC Pres

 

SEE POST ABOVE!!
Seriously Midnite what are you running those tires you have at?
Steve
DOC Pres

the pressure on the tire says 50 psi max. I fil it to 50-53 when its cold?

Did you read anything people wrote and the link posted?

 

I guess he likes the Bump, Bump, bump!

 

Running max pressure will give you the ride of a skateboard, one of the old school types with the steel wheels. Only do this when the D is fully loaded to maximum weight or heavy towing. Run the lower numbers, like 35 pounds as stated by the other posters. Your tires and your kidneys will thank you.