rear tire pressure
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Freshman User
Joined: Sep 2006
Posts: 26
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rear tire pressure
I was wondering what you guys feel is a safe rear tire pressure for an unloaded truck. They had mine set at 80 psi which made it ride rougher than a track car. I lowered it to 60 and it is ALOT better riding. I was wondering if I could go lower safely.
Elder User
Joined: Oct 2005
Posts: 786
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From: Reno nv
I run 60 front and 65 rear also in an '00 CC long bed. went through 1 st set of tires at 50psi F & R and noticed a bit of edges wearing out about 10000 miles sooner than the middles on 60,000 worth of tire miles. So far the tires mic the same depth to .001 all across the tread with 30000.
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Yeah, 80 psi will reduce wear and rolling resistance but ride like it is on rails. I've found that I get a certain amount of hop or imbalance in the rear when driving with higher pressures. Lower it and the ride is good but wear increases. Yay.
Senior User
Joined: Jul 2004
Posts: 262
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mine is a sc diesel with 285s on stock rims and i run about 40 in the front and 35 in the back. the best way to find the best psi is the chalk method. draw a line on your tire and drive it 20 feet see wear the wear is and adjust the psi acondingly(middle only lessen, outside only add)
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Elder User
Joined: Mar 2006
Posts: 751
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From: Greeneville,TN
Here is my experience with tire pressures. I run more in the front than in the rear. I will add about 5psi if towing to the back tires. Right now I have 65 front and 60 rear. I monitor how my tires wearby using a tire depth gauge to measure the tread depth. If the outside of the tires are wearing more than the inside then I add pressure. If the inside is wearing more than the outside then I take pressure out. I have gotten great wear on all my tires doing this. I don't know if you will believe me or not but my grandfather got 107,000 thousand miles on a set of Michelin LTX M/S on his 1997 F250 extended cap!!!
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Junior User
Joined: Jul 2006
Posts: 87
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From: South Central, PA
Here's an interesting question - How do the Engineers arrive at the tire pressure levels posted on the Driver's door? This obviously has to have some sort of basis. Is it for safety?
I don't know, but I remember something about SUV tire pressures allegedly causing accidents/injuries and I believe it was involving Ford and BFG tires. I think the end result was to stick with the pressure posted on the door label.
I am following the label pressure for the front and 65 rear (Unloaded), 75 rear (Loaded).
I don't know, but I remember something about SUV tire pressures allegedly causing accidents/injuries and I believe it was involving Ford and BFG tires. I think the end result was to stick with the pressure posted on the door label.
I am following the label pressure for the front and 65 rear (Unloaded), 75 rear (Loaded).
Senior User
Joined: Jun 2006
Posts: 383
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60 in the front, 65 in the rear DRW.
I grew up in southern california and am here now visiting. Anyone that has ever driven in southern california know how much hell the freeways are in a 3/4 or 1 ton. Even a 1/2 ton is pretty bad. Only place in the country like it!
I grew up in southern california and am here now visiting. Anyone that has ever driven in southern california know how much hell the freeways are in a 3/4 or 1 ton. Even a 1/2 ton is pretty bad. Only place in the country like it!
Elder User
Joined: Nov 2004
Posts: 682
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From: South Eastern MN
I have to admit that I run 65 in the front and 35-45 in the back, it all depends on the shape and wear patern of the tire. I do inflate to 70 or 80 when I do tow, but that's usually huge 23.5 ton loads around the farm. Heck, I even up the presure if I'm hauling my 4 wheeler.
Postmaster
Joined: Jan 2004
Posts: 4,758
Likes: 7
From: colorado
why do so many of guys run more air in the rear tires compared to the front while unloaded? there is quite a bit more weight in the front if unloaded. i have 285/75-16's and unloaded run 54 front and 46 rear
Elder User
Joined: Nov 2004
Posts: 682
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From: South Eastern MN
We have had four F-350's running 265/75R16LT Cooper H/T's and we allways had a problem with the midle of the tire wearing faster than the outside because we never did any hauling. So we dropped the rear presure to 30-35 on used tires with the poor wear patern and we run 45 on new or non effected tires. I also plan to run 40 in the rear on my up coming Cooper S/T-C's.
