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What did you do to your Ranger today? (Part Deux!)


85_Ranger4x4

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Did some some black friday/weekend shopping for it...
 


85_Ranger4x4

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PetroleumJunkie412

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PetroleumJunkie412

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sgtsandman

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31X10.5R15/265/65R17

85_Ranger4x4

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lil_Blue_Ford

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ekrampitzjr

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First time in a while, checked the air in all four tires before a trip on Saturday and found the rears were just below 30 psi. Surprised the tire sensors didn't turn on the nag light on the dash display, because any tire getting below 30 is when the one in my Mazda trips. The fronts were around 31–32 psi.

Topped the front tires to 38 and the rears to 40. On the trip my fuel economy went from 20 miles per gallon to 22, staying at 55–60 mph most of the way.

When the temperature drops and stays cool, check your tire pressure because it will go down with temperature.
 

sgtsandman

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Every 10 degree of drop or increase in temperature equals about 1 psi of change in tire pressure when they are cold (driven less than a mile or has sat more than 3 hours).

Plus whatever leakage the tires might have on their own. Even a brand new tire on a brand new rim will lose air over time.

As far as the stated tire pressures, it’s your truck and too much pressure is less of a problem than not enough. Even with LT tires, tire pressure shouldn’t be more than 35-36 unless you are hauling a load.
 

Rowdy Fitzgerald

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My buddy taught me how to “chalk” a tire when setting the psi. So you’ll need to do this on decently flat paved road. Get kids sidewalk chalk, cover the tread of the tires from sidewall to sidewall and halfway around each tire. Drive forward 50 foot and see how much chalk wore off. Adjust the psi up or down until the only chalk that doesn’t get worn off is on the outside 1/4” or so of the tread.
 

sgtsandman

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The other way to do it is to take the max psi of the OEM tire and divide the max load by the max psi. That will give you the number of pounds per 1 pound per square inch that tire will hold. Multiply that number by the recommended psi to get the load per tire the truck was set for.

Now do the same thing for the new tire. Divide the max load by the max psi. Take that number and divided by the load set by the manufacturer to get the psi needed for the new tire. It’s usually pretty close to the OEM recommendation.

Some tires, like LTs, don’t like too much pressure for the weight carried. They tend to wander and not track straight. Other tires won’t care but will wear faster in the center because there is too much pressure and it’s rounding out the tire.

Rowdy’s suggestion will definitely work but the above will get you right on the money with less playing with psi numbers to dial it in. But the above method requires doing math and I know some hate doing math.
 

lil_Blue_Ford

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I know with my choptop when I put the 35’s on I put 35# of air in them. Thing rode worse than a brick. Did the chalk trick, and finally settled on 10-12 psi rear and 12-14 psi front. Tread wears evenly and I don’t feel every pebble. Want to say I’m around 25 psi in the Ranger and I almost think it’s still a little on the hard side.
 

Rowdy Fitzgerald

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I like running load range E tires, so I don’t run much pressure in them either.
 

CrabGuy

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A man with a tire pressure gauge will always know the exact pressure; a man with two gauges will never know.
 

PetroleumJunkie412

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