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Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
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Old 05-13-2009
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Searched Maybe not long enough

I have searched i tried psi and grabber at2 but maybe just didnt type the right thing but im going on a 1800 mile trip and want to know what psi i need to put my tires at for good mileage and proper wear they are the general grabber at2's and according to the door they are suppposed to be at 30psi the tire can handle 44psi when i was lazy and took my truck down for an oil change they put them at 35psi so yeah, thanks sorry again if its been posted before just trying to get the truck ready for the long drive. oh yeah they are the 255/70/16
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Old 05-13-2009
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33-40 depending on rim size, truck load, truck weight
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Old 05-13-2009
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the door sticker is for the stock tire setup. id feel safe rolling on 35 lbs
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Old 05-13-2009
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35 should be good, are you plannin on hauling anything, or is it just your truck?
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Old 05-13-2009
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they are on 16inch stock rims and i'll be loading my motorcycle in the bed
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Old 05-13-2009
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You will be fine at 30-35, no matter what weight you have in the bed or the tire size.

The PSI on the tire is the MAX pressure for the tire. The only thing it means is do not inflate past that point. It does NOT mean thats what the tire needs to be at
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Old 05-13-2009
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I would run about 40psi, to ensure that the tire is not under inflated. My tires are rated for 45psi max, and start bulging (under inflated) around 30-33psi, so I keep them around 40-42psi to maximize tread patch and low rolling resistance. Over inflating them will do no good though, so keep it in the safe zone.
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Old 05-13-2009
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Quote:
Originally Posted by Johnbaum13 View Post
I would run about 40psi, to ensure that the tire is not under inflated. My tires are rated for 45psi max, and start bulging (under inflated) around 30-33psi, so I keep them around 40-42psi to maximize tread patch and low rolling resistance. Over inflating them will do no good though, so keep it in the safe zone.
40 is way to much i dont care if they bulge. 35 is perfect. If they bulge its a soft tire. 35 is what they should be at when you put weight in the bed tire pressure goes up automatically due to pressure (DUH)! If there wearing in the middle more then sides then its to high. If there wearing on sides more then middle its too low. You can put them slightly higher puts less tier on the ground=less resistance=gas mileage, but not 40.
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Old 05-13-2009
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alrighty thanks for all the help guys
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Old 05-13-2009
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Hahaha
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Originally Posted by "Monster Truck" View Post
40 is way to much i dont care if they bulge. 35 is perfect. If they bulge its a soft tire. 35 is what they should be at when you put weight in the bed tire pressure goes up automatically due to pressure (DUH)! If there wearing in the middle more then sides then its to high. If there wearing on sides more then middle its too low. You can put them slightly higher puts less tier on the ground=less resistance=gas mileage, but not 40.
Tire pressure does not go up while under a load. If that was true when we mount a tire and put in on the vehicle when we drop the vehicle the tires would pop....

Quote:
Originally Posted by Johnbaum13 View Post
I would run about 40psi, to ensure that the tire is not under inflated. My tires are rated for 45psi max, and start bulging (under inflated) around 30-33psi, so I keep them around 40-42psi to maximize tread patch and low rolling resistance. Over inflating them will do no good though, so keep it in the safe zone.


That sound like a lady that came in one day. Her tires were inflated to 115 PSI. She filled them that full because thats when the side walls were straight. That was a blow out waiting to happen.
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Old 05-13-2009
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When I say bulging, I mean when the drivers side starts to lean 'cause of the tire being low. I run squad car spec 235/55 17s. Very square shouldered tires. If the tire is bulging noticeably at the bottom on mine, they're under inflated. Now on the stock 225/70 15s, yeah they bulge anyway.
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Old 05-13-2009
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35 - 38 psi. I run 38 on all my tires.
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