is there a tire psi change for larger tires? (1 Viewer)

[SL404]

the door jam sticker says 29 psi front/32 rear for the standard 275 70/16 tires

What would the correct psi be for 275 65/18 tires? Would it be the same or is there an adjustment?

thanks for your help!

 

[Mike NXP]

Did you change the load range rating as well?

Use this tool
>>Tire Pressure Calculator - https://tiresize.com/pressure-calculator/

 

[Mike NXP]

I shouldn't matter if you keep the same load rating. If you stepped up to E rated then you will need more air to maintain the same load rating.

 

[Patassa]

You can also you tube the chalk method, which consist of applying chalk to the tread, driving down a straight road, then checking the wear pattern. You would then inflate or deflate until you see even chalk wear.

 

[Jack90210]

Check this attached document to explain why LT tires need more pressure to attain THE SAME load rating as P-rated tires, if applicable.

(Attached: Toyo Tires Technical Bulletin document TSD-12-011 August, 2012: "Replacing Tires on Light Trucks")

 

[AHdon]

Playing with tire pressures right now with a set of Yoko's AT G015 P/m, 275/65/18 have them at 35 and they seem ok, maybe a little hard riding. Might try 32.

 

[Mike NXP]

Dont need to be making this more complicated than it has to be. The load rating changes when you go to an E rates tire and you simply adjust the PSI to achieve the same load rating .

The link I posted helps convert or just use the manufacturer posted spec on the load rating for our vehicles.

Now is it gunna be a harsher ride , yeah probably, but if you want the proper wear of your tires and load rating you gotta pump em up.

 

[cmw]

Extremely helpful thread! Was pondering this, thinking there probably was a calculation to get things started...

Will wait for nicer weather to do a chalk test.

 

[TexLexican]

Why are the big retailers now inflating to 36 instead of the recommended psi? Forever it seemed that 32 psi was the standard.

 

[newbielx470]

Is below correct for 2006-07 LC from stock to BFG KO2 LT275/70R18?

 

[Mike NXP]

Is below correct for 2006-07 LC from stock to BFG KO2 LT275/70R18?

View attachment 3254985

No, look at the numbers that is converting to a 17 inch tire . Then again the bottom shows the right info , idk , click link below and just make sure your entering the proper info from the p or sl rates to the e rated

Click link below and enter your stats to get some info
>Tire Pressure Calculator - Tire Pressure Calculator - https://tiresize.com/pressure-calculator/

 

[newbielx470]

No, look at the numbers that is converting to a 17 inch tire . Then again the bottom shows the right info , idk , click link below and just make sure your entering the proper info from the p or sl rates to the e rated

Click link below and enter your stats to get some info
>Tire Pressure Calculator - Tire Pressure Calculator - https://tiresize.com/pressure-calculator/

Hi Mike, thanks for the helpful info. I think the "LT285/70R17" in the first line on the right side is just a default example of the tire size format. The lines below are what I specifically selected.