Tires say 50 psi max. Gets COLD up here I tend to want to run them about 40 psi Hows my thinkin? Thanks :slight_smile:

My question was more about the temperatures I drive in.-40 & -50 Temp has NOTHING to do with what you want to set the tire pressure at. Temp will effect tire pressure in that for every 10 degrees your tire pressure drops 1lb. Example: If you inflate your tires to their recommended pressure of 32lbs …

Joseph, with respect, if the size of my manual is the size of your phone book, you must live in a very, very small town. Owners’ manuals are small and well indexed. Owners should read them. Besides, the manufacturers IMHO go to extreme lengths by putting a claer label right on the doorjam to try to …

Ya’ know. A bit of info would be cool. What vehicle are we talking about? What was the original tire size? What’s the current size?

96 laredo Factory: 215/75R15 - 36psi Current: 245/75R16

That is a substantial difference in tire size with 3 inches in diameter and a 10% difference over all. In this case, I amend putting more then 36 lbs in and would put in LESS. IMO, you could easily be running 30 to 32 lbs. Personally, unless you have a problem with handling, I would keep the lrger…

The 215/75R15 was the minimum tire size on the 1996 Grand Cherokee, 225/75R15 was much more common. The 235/75R15 was an option and 245/75R16 is about 1 1/2" larger in diameter. Later years used the 245/75R16 (WJ) and the tire pressure label usually reads 33 PSI. On a side note I found an interest…

I’ve no doubt that that’s all correct, Nevada, however one needs to be aware of rim sizes when looking at optional tire sizes. Manufacturers will often offer different tire options, but usually on rims that are different widths.

Max Tire Pressure

General Discussion

badbearing November 6, 2012, 12:14am 28

Current tires are too big in my opinion
I’m thinking about going to 15" rims with 30x9.5 rubber.

Are 30x9.5 - 30 inches in diameter?

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Max Tire Pressure

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