How many psi for 245/75R16


likea3andit

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Recently got 5x 245/75r16 for free (tires & rims) to replace my 225/70r14 on my 94' 2.3l 2wd. Everything fits good and feels good. But I'm not sure the best psi to run... I'm thinking the truck may have had some sorta lift before I got it, because of how well the new wheels fit. I've got good clearance, it rides good, and the speedometer isn't as off as it was with the stock 14s.

The tires say 80psi max, the stock were 35psi (or 32 can't remember) right now I'm running them at 55psi.
 


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Bird76Mojo

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Whatever the door sticker says. Run that. To start out with at least. You can always vary the pressures to your liking after that..
 

Uncle Gump

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80 psi max seems like those are E rated truck tires. My E rated truck tires get run with 31 psi front... 28 psi rear and I get a full contact patch at those numbers.

I personally think 55 psi is way to high.
 

ericbphoto

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I agree with bird. Start with the door sticker recommendations. The pressure you need is based more on the load they will be bearing, ie; the weight of your vehicle.
 

pjtoledo

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I once had 245/70-16 on my 2005 2wd reg cab. that light of a truck doesn't need much pressure on a large tire, I ran 28 PSI.
 

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yeah, running that high of pressure will wear out the center tread of tire and will make for a rougher ride. You must have low gears to be able to handle a tire that size. I went from 225/14’s to 235/15’s but Ive also went from 3.45 to 4.10 gearing. Im running 30 psi
 

likea3andit

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Thanks for the advice! I wasn't sure if psi was soley on load weight or if different size tires had different requirements.

And yeah I'm pretty sure they're E class. I don't know what they came off of, but they fit like a glass slipper and my old tires were about shot and I didn't have a spare for when one of them did go... But thanks again I appreciate it.
 

sgtsandman

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Stock door jam pressure seems to be the best starting point in most cases. That is what I stuck with when I went to 31s. I did do the math to figure out what they should be (33 psi) but 35 is so much easier to work with on a tire gauge and won’t make that much of a difference in ride or wear.
 

JohnnyO

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They are larger than stock and have a higher load rating so you should run a bit less air than the sticker says. I would start out with 30 psi in all four and see how they wear and adjust accordingly.
 

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The pressure on the tire is the max psi at the max load limit. You're not coming close to that on a ranger. As everyone else said... Follow the door sticker, adjust as needed.
 

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Method #1 - Accurately weigh your truck . Compare the weight load on each tire, compare to the weight capacity of each tire . Break out your calculator, and do the algebra .

Method #2 - Use chalk across the tread , and tweak the tire pressures to get even contact across the whole width .

Method #3 - A few minutes playing with calculator to compare estimated airspace volumes , and a good starting point would be aprox 1psi less than you prefer for 235's . Ie , if you are happy running 30psi in 235/75-15 , try 29psi in the 265 /70 .
 


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