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Old May 10th, 2012, 09:19 AM   #1
87mopar
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Default Tire pressure on ".5" rims

I have a 8800lb f250 with 39.5x16 on 16.5 rims. I'm a newb to this big of a tire and the 16.5 rim. I usually sit around 8-10lbs on the dunes. I've never had a truck this big. To my understanding a 16.5 tire doesn't "lock" on the bead of the rim. I planed on starting at 13lbs but am not certain if that's even ok. If it was any of my jeeps on any other rim I would be fine. My basic question is- I'm a newb what tire pressure is good for a 39.5x16. R16.5 on a f250?
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Old May 10th, 2012, 09:24 AM   #2
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It depends on the load range. Heavier load ranges you can run lower pressure and lighter higher. And also the rim width.

Last edited by Monster80; May 10th, 2012 at 09:28 AM.
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Old May 10th, 2012, 09:25 AM   #3
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Durr should have added that load range D
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Old May 10th, 2012, 09:30 AM   #4
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Where did you come up with 8800lbs? Does it have a engine in the back and front?
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Old May 10th, 2012, 09:31 AM   #5
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It would be safe to run around 10lbs. That's what my brother runs on his chevy 2500 same tire and rims and They haven't came of yet. But much lower than that your tempting a flat.
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Old May 10th, 2012, 09:33 AM   #6
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My cousins 4 door f250 weights 8800lbs
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Old May 10th, 2012, 09:36 AM   #7
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That is what mine is
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Old May 10th, 2012, 09:37 AM   #8
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That is what mine weighs but my question is does that rim size matter?
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Old May 10th, 2012, 09:39 AM   #9
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No it doesnt matter
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Old May 10th, 2012, 09:40 AM   #10
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It might be a little work getting them on but it will work
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Old May 10th, 2012, 09:43 AM   #11
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Alright thanks
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Old May 10th, 2012, 09:45 AM   #12
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That's f*cking heavy, and 8-10 should be fine.
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Old May 10th, 2012, 09:50 AM   #13
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16.5s suck
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Old May 10th, 2012, 10:01 AM   #14
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Quote:
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16.5s suck
Yes
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Old May 10th, 2012, 08:48 PM   #15
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8800 lbs is likely your gross vehicle weight rating, not your weight. They tend to weigh around 5800-7000, depending on cab configuration and engine.
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Old May 10th, 2012, 08:55 PM   #16
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Buy a set of innerairlocks from Ironman. Otherwise no lower than 10 PSI on a 9.75 wide rim.
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Old May 10th, 2012, 11:02 PM   #17
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Quote:
Originally Posted by Haggar View Post
They tend to weigh around 5800-7000, depending on cab configuration and engine.
??? That seems pretty low.

If his truck is a 4wd, 4 door diesel with 39.5 tires i would think it weighs over 8k.
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Old May 11th, 2012, 05:03 AM   #18
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My rims are 12" wide, and no diesel
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Old May 11th, 2012, 05:25 AM   #19
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That could cause a problem being such a wide rim.
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Old May 11th, 2012, 05:35 AM   #20
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Quote:
Originally Posted by Renegade II View Post
Buy a set of innerairlocks from Ironman. Otherwise no lower than 10 PSI on a 9.75 wide rim.

get these $800ish from ironman installed, save the trouble, I still havent but dont drop my 16.5 x 12 rims under 12 psi in the warm days 15 in the snow. mine are D range tires and Bias

Quote:
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My rims are 12" wide, and no diesel
carry a spare, or air, or both, as everyone siad 16.5's suck. You could try welding on a bead to make the rims work like all the rest it will cost you less the inner airs but makes it a pain to put on the tire I am told.
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