tire pressure with 37s - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 04-09-2012, 06:08 AM Thread Starter
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tire pressure with 37s

I have nitto trail grapplers and was wondering what the best tire pressure was when running these? All I have is a leveling kit and 37s

09 F-250 King Ranch
H&S Mini Maxx/ HD Tune/ 5" Flo~Pro/ AFE PDS Intake
Leveling Kit with 37x12.50 R20 Nitto Trail Grapplers
CCV Mod
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post #2 of 6 Old 04-09-2012, 11:08 AM
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whatever it says on the side of the tires.


2010 F-350 CC SRW LongBed 4X4
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post #3 of 6 Old 04-09-2012, 01:49 PM
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Quote:
Originally Posted by jac97psd View Post
whatever it says on the side of the tires.
I wouldn't recommend that at all. If you run maximum PSI in 37's then it's gonna ride like crap and you won't maximize your mileage like you could.
I personally run 55 psi in the front, and 45 psi in the rear when empty. I have only had them on for 1000 miles, but they seem to be wearing good. I'm gonna lower the rear a little bit more due to the fact that the most outerlying row of nipples on the TOP of the tread lugs are still showing. That indicates to me that I can deflate them a little more to get them to sit flat and wear the entire surface. If and when you tow then I highly recommend to run higher pressures when under load.

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post #4 of 6 Old 04-09-2012, 08:36 PM
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The pressure on the side of the tire is the maximum allowed on the recemmended wheel. This is usually only used under max load situations.

Also don't go by the number written in the door either since that is intended for the stock tires and again under maximum load situations.

For an E-rated 37 on these trucks you shoulf be able to go down to about 35 in the rear and 45 up front and still get decent wear out of the thread. In most cases you can go even lower to get a better ride and more traction but you will start to see faster tread wear.



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post #5 of 6 Old 04-09-2012, 09:31 PM
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Also depend on you tire width vs wheel width, lots of variables! Just gotta find that sweet spot.

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post #6 of 6 Old 04-10-2012, 04:59 AM
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Ya my trail grapplers I ran at 55 front and 50 back and still could have used some out of the back

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