Tire Pressure
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Elder User
Joined: Sep 2004
Posts: 750
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From: Weimar,TX
Tire Pressure
Just had my tires rotated at 6000 miles and the front tires seemed to be wearing more on the edges. I am running the stock tires, 265/75/16 Pirelli Scorpions.
If I am reading the plate on the door panel correctly, it recommends 45 in the front and 70 in the rear and thats about where I have kept it.
What do you guys think?
thanks,
Jack
2004 CC V10 Lariat 2WD
If I am reading the plate on the door panel correctly, it recommends 45 in the front and 70 in the rear and thats about where I have kept it.
What do you guys think?
thanks,
Jack
2004 CC V10 Lariat 2WD
Lead Driver
Joined: Aug 2004
Posts: 5,326
Likes: 18
From: Gilbert
I wouldn't go by what the door panel says, I'd go by what it says on the tire. Seems odd to have them at separate pressures. I could understand if you were pulling a trailer all the time but under normal driving conditions, I'd keep them the same. I kept the original tires I had on my truck at 65psi and they last quite a long time. My next set (BFG Mud's) I kept at 35 even though they recommended much higher. It was too rough of a ride at the higher pressure but they still seemed to wear normal. If your tires are wearing on the outside faster than the inside then it's due to low pressure. I'd keep 'em all at about 65 and see how the ride feels and see if the tires wear a bit better. Just my .02.
Senior User
Joined: Oct 2004
Posts: 232
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From: Salisbury, MD, USA
Originally Posted by 2000silverbullet
I wouldn't go by what the door panel says, I'd go by what it says on the tire....
The sticker, on the vehicle, is based upon the tire and the vehicle, by the engineers. That is what I follow.
Elder User
Joined: Dec 2001
Posts: 527
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From: Central WA USA
I'd go by what the door panel says also. I tried to put 80 PSI on these tires with no load in the bed and it was way squirrly on the road due to being overinflated. Max PSI on the tire is 85, but door panel says 45/ 65. It rides much better with it set on what the door panel says.
Post Fiend
Joined: Oct 2002
Posts: 11,314
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I'd do something completely different....
the chalk test....
Used in autocrossing to ensure the entire footprint is contacting the ground to get as much side grip as possible.... but what it really does is ensure the tire is properly inflated...
get on a nice level straight section so you can roll a bit and stop without issues...
take regular chalk and draw a line across the footprint of all four tires...
start easy, drive straight and stop easy....
get out and see if the chalk is wearing evenly across the tire...
if more gone on the outer edges than the middle - add air to that tire...
if more in the center than the edges, let air out...
if none is gone - drive more
do this until even wear on the chalk lines across the tires.
then write these pressure down for future use...
What this does is set the pressure for THAT tire on THAT wheel on THAT truck...
Now, if you add or remove a LOT of weight, do it again....
(Like when I lose this extra 100 lbs around my belt.... )
the chalk test....
Used in autocrossing to ensure the entire footprint is contacting the ground to get as much side grip as possible.... but what it really does is ensure the tire is properly inflated...
get on a nice level straight section so you can roll a bit and stop without issues...
take regular chalk and draw a line across the footprint of all four tires...
start easy, drive straight and stop easy....
get out and see if the chalk is wearing evenly across the tire...
if more gone on the outer edges than the middle - add air to that tire...
if more in the center than the edges, let air out...
if none is gone - drive more
do this until even wear on the chalk lines across the tires.
then write these pressure down for future use...
What this does is set the pressure for THAT tire on THAT wheel on THAT truck...
Now, if you add or remove a LOT of weight, do it again....
(Like when I lose this extra 100 lbs around my belt....
)
Last edited by jdadamsjr; Jan 31, 2005 at 02:03 PM.
Lead Driver
Joined: Aug 2004
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From: Gilbert
Originally Posted by walc
Tires aren't labeled regarding driving air pressure. They are only labeled as to maximum air pressure.
The sticker, on the vehicle, is based upon the tire and the vehicle, by the engineers. That is what I follow.
The sticker, on the vehicle, is based upon the tire and the vehicle, by the engineers. That is what I follow.
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Freshman User
Joined: Jan 2005
Posts: 30
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Tires aren't labeled regarding driving air pressure. They are only labeled as to maximum air pressure.
Truck and trailer tires - LT and ST, state on the side wall: "maximum load at __ psi"...it does not state a maximum pressure - it gives you a max load for a pressure. If you go to the tire manufacturer's web site, they have a "tire loading and inflation pressure chart". The correct minimum pressure is determined by the weight the tire is supporting, and you can only know that by weighing your vehicle.
I believe the sticker on the door of a vehicle with LT tires provides the pressure for a maximum loaded vehicle.
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Joined: Feb 2004
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From: Western New York
The door panel and the pressures on the tires are all a guide. I would agree with jdadamsjr's chalk method to a point. That being I would drive the vehicle the way you always do. That way you get an accurate reading based not only on the vehicle, but the driver's normal driving pattern. When I use to road race I was always was able to make my tires last longer than most of my competitors. It was just my driving style. Some people just naturally are harder on the go and stop pedals than others. Same thing when they corner and you want to capture all of that when you do the chalk method.
jdadamsjr is correct in that you want to redo the chalk test whenever you make adjustments to your vehicle such as adding or taking away weight, different tires, even changes in the outside temperature will greatly effect tire pressures.
jdadamsjr is correct in that you want to redo the chalk test whenever you make adjustments to your vehicle such as adding or taking away weight, different tires, even changes in the outside temperature will greatly effect tire pressures.
Posting Guru
Joined: Oct 2004
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From: Lynden, WA.
Originally Posted by Ronin007
The door panel and the pressures on the tires are all a guide. I would agree with jdadamsjr's chalk method.....
jdadamsjr is correct in that you want to redo the chalk test whenever you make adjustments to your vehicle such as adding or taking away weight, different tires, even changes in the outside temperature will greatly effect tire pressures.
jdadamsjr is correct in that you want to redo the chalk test whenever you make adjustments to your vehicle such as adding or taking away weight, different tires, even changes in the outside temperature will greatly effect tire pressures.
But, and I'm not sure that anyone else pointed this out. Surprised actually. -Hard cornering, no matter what tire pressure you're running will wear the outside edges more rapidly. If you're wearing more on both edges in front, then I'd figure you need more pressure. That V10 is a heavy bugger, if you're running empty most of the time, you'll want as much as ten more pounds in the front than you'll need in the rear. Remember to adjust all pressures if you're hauling a load. And never excede the tire's rating for load and maximum pressure.
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