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  #1  
Old 12-01-2012, 11:18 PM
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Default Tire pressure on 22" RT's. crew cab

What is the proper tire pressure for a crew cab with the stock fortera 285 45 ?
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Old 12-02-2012, 10:02 AM
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Look in the door jamb it shows the stock psi's.
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Old 12-02-2012, 10:49 AM
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It doesn't show stock psi for 22's. I don't know if size matters at all but I have never thought about it. I believe I have 40 psi in my nitto 420's.
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Old 12-02-2012, 07:06 PM
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The psi in the door jamb is for the stock 275 60 20, which is 35 psi cold. I know there is a formula using the weight of the truck and the load index of the tire. Both tires have totally different load index. I just don't know how to figure that out.
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Old 12-03-2012, 05:48 AM
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You can also check the tire manufactures web site, some post that info.
In general the tire pressure listed on the door jam is a good starting point and pretty close to what you should run. The PSI requirement won't change based upon the tire size, the the volume of air will. The load rating and tire structure will play a role in how much pressure is needed for what you are looking for (tread wear, softer ride, hauling, etc).
The easiest way would be to chalk the tires, start at the recommended psi, then go up or down a few psi, then adjust from there.
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Old 12-03-2012, 08:23 AM
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Though I've never tried it, some people who have changed/updated their tire/wheel combination swear by the drawing of a chalk line method --

Copied & Pasted - You can always use the chalk line method: Start off with the OEM pressure, draw a even pressure chalk line across the tires and drive app. 30 feet. The wear on the chalk line should be even. If you have some left on the outside edges of the tire, you have too much pressure, if you have some on the center, you have too little pressure. Again, wear along the tire/chalk should be even...

For the record, on all previous vehicles I've owned - where the wheels and/or tires have been changed and altered in size from OEM - I've always inflated tires 2-8 PSI above the door placard.
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Old 12-06-2012, 09:15 PM
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I'm running about 37-38 in mine and the tire seems to be wearing pretty even. Had them on for about 10K now.
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Old 12-08-2012, 12:52 AM
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Quote:
Originally Posted by Jayincali View Post
I'm running about 37-38 in mine and the tire seems to be wearing pretty even. Had them on for about 10K now.
What he said, I'm running 38psi on the 22's and they were evenly minus my empty parking lot antics
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Old 12-08-2012, 01:18 AM
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Cool, thanks. I noticed the truck rides smoother on 39-40 psi. Anything under the ride is more harsh.
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Old 12-08-2012, 02:43 PM
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I'm running 40 psi in my nitto 420s 22's.
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