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post #1 of 27 (permalink) Old 05-31-2010, 06:17 PM Thread Starter
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Tire PSI

I'm running 265/70/17 big horns on the XK pretty aggressive tread. My question is on the amount of tire pressure I should be running at. They were installed with about 37PSI but the tire says 60PSI. I know what pressure to run for sand and off roading mud and rocks. But what are you guys running on the street with these type tires. I know more PSI better gas mileage I think but would like some feed back on what you guys are doing. 60PSI just seems Like a lot to me any feedback would be great thanks.


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post #2 of 27 (permalink) Old 05-31-2010, 07:25 PM
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Sal?
That 60 psi is max mounting/operating pressure to achieve the per tire weight rating that is molded into the sidewall.
Obviously, your vehicle doesn't weigh near what the combined weight the tires can safely support so 60 psi would not be needed.
I suspect at that pressure with your weight, they would hardly conform to the terrain.
If they were on my vehicle I would be operating in the 35 to 40 psi range......much more than that and I think you would be able to call heads or tails if you ran over a dime.

My thoughts,
Rob


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post #3 of 27 (permalink) Old 05-31-2010, 07:28 PM
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The 60 psi is probably the max pressure for max load. I run a similar size tire and just keep it above the point where I get the low tire warning. At 60 psi the tire will be hard and will not give you as comfortable of a ride as it will at lower tire pressure. You might get a little better mpg but the trade off is a stiffer ride. You can safely run at lower pressure as long as you are not overloaded. Many tire failures occur because of running a tire at too low of pressure and it getting hot and failing. I do not think there is much danger of this at 37 to 40 psi

edit: I just saw that Robby said pretty much the same thing as I was posting. You can't get better advice than from Rob.

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post #4 of 27 (permalink) Old 05-31-2010, 09:00 PM
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A general rule of thumb is to check your tire pressure cold then get the tire up to operating temperature (30 minutes on the highway). Pull over and check the tire pressure it should have risen 4psi. If it has risen higher the cold pressure was too low if the pressure rise is lower than 4psi then the starting pressure was too high. It is pretty easy to do then you have the optimum pressure for the tire type/ vehicle weight. Anyway thats the way i do it when I get new tires on the car or trailer.
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post #5 of 27 (permalink) Old 05-31-2010, 09:50 PM
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I run my Cooper STT's at 50 PSI, and they are 10 ply with a 80 PSI max pressure. If I start to notice that the center of the tire is wearing quicker, I will back it down to 40 PSI or so but no problems yet.


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post #6 of 27 (permalink) Old 06-01-2010, 07:36 AM
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Sal,
Did you keep your TPMS after you installed the new tires?
What effect will the higher pressures have on the system?


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post #7 of 27 (permalink) Old 06-01-2010, 08:17 AM Thread Starter
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Quote:
Originally Posted by cico7 View Post
Sal,
Did you keep your TPMS after you installed the new tires?
What effect will the higher pressures have on the system?
Ya I kept it. I know 60PSI is way to much but was thinking 37PSI was to low. Probably going to try 44PSI and see how the tires are sitting at the pressure.


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post #8 of 27 (permalink) Old 06-01-2010, 08:22 AM
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I set my tires at 40 ( all 4) for a trip a couple years ago and the tpms lights kept blinking until i reduce pressure. Maybe because the spare was still set at 37


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post #9 of 27 (permalink) Old 06-01-2010, 11:11 AM
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if you wanted to get really technical about it you can do the chalk test.

find a smooth and level conrete surface (like a long driveway) and coat it with sidewalk chalk, enough so that you will see a full rotation of the tire across it. drive across it slowly then stop and get out. take a look at the pattern left on the concrete and also the chalk that's on the tire. it should be even all the way across.

if it's not then you need to correct your pressure. if the center shows more than the edges of the tread you have too much air, if the edges show more than the center of the tread you too little air.

for optimal offroad traction you should air it down to about 12lbs and continue to lower it until the tire starts to burp air from the bead, or starts to spin on the rim, then bump it up 2 lbs.
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post #10 of 27 (permalink) Old 06-01-2010, 01:11 PM
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