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-   -   Tire pressure on 22" RT's. crew cab (http://www.ramforumz.com/showthread.php?t=127292)

57hemisport 12-01-2012 10:18 PM

Tire pressure on 22" RT's. crew cab
 
What is the proper tire pressure for a crew cab with the stock fortera 285 45 ?

rdsabin 12-02-2012 09:02 AM

Look in the door jamb it shows the stock psi's.

GhostR1der 12-02-2012 09:49 AM

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.

57hemisport 12-02-2012 06:06 PM

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.

NWRQC 12-03-2012 04:48 AM

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.

Grubrunner 12-03-2012 07:23 AM

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.

Jayincali 12-06-2012 08:15 PM

I'm running about 37-38 in mine and the tire seems to be wearing pretty even. Had them on for about 10K now.

InDeepWaterBlue 12-07-2012 11:52 PM

Quote:

Originally Posted by Jayincali (Post 955100)
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 :gy:

57hemisport 12-08-2012 12:18 AM

Cool, thanks. I noticed the truck rides smoother on 39-40 psi. Anything under the ride is more harsh.

GhostR1der 12-08-2012 01:43 PM

I'm running 40 psi in my nitto 420s 22's.


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