Tire Pressure Question
Thread Starter
JK Super Freak
Joined: Mar 2010
Posts: 1,139
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From: The OC
Tire Pressure Question
I have BFG KM2's. The side of the tire says max pressure is 50 psi. When I am off road I run them down to around 12 psi.
QUESTION: What is the right pressure to run on the streets?
QUESTION: What is the right pressure to run on the streets?
JK Enthusiast
Joined: Nov 2008
Posts: 138
Likes: 0
From: Tucson, AZ
It all depends on your tire size and also the rim width. I can tell you it's not 50! You could ask around and see what other guys with your setup are running, but the best way to figure it out is to do the chalk test. That willl give you the best tire pressure for your rig to account for your bumper weight and such. Get yourself some sidewalk chalk(kids aisle at walmart). Then chalk the contact surface of your tire. take it for a little drive at speed.(a mile or so) then look at how the chalk is worn. If you have more chalk at the edge than at the center, your tires are underinflated. If you have more chalk at the center, they are overinflated. I have km2 32's and I run 33 psi @ all four corners.
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
From the Faq's...
Q: On the road, what PSI should I be running in my tires?
A: For optimal comfort and even tire wear. you should not run the recommended PSI listed on the sidewalls of your tires. Typically this will be way too much. On average for a 33" tire, I would recommend that you run your tires at approximately 28-30 PSI. For a 35" tire, I would recommend running approximately 26-28 PSI. For a 37" tire, I would recommend approximately 24-26 PSI.
Q: On the trail, how much should I air my tires down to?
A: Typically, I recommend that people air the tires down to about 10~15 psi.
A: For optimal comfort and even tire wear. you should not run the recommended PSI listed on the sidewalls of your tires. Typically this will be way too much. On average for a 33" tire, I would recommend that you run your tires at approximately 28-30 PSI. For a 35" tire, I would recommend running approximately 26-28 PSI. For a 37" tire, I would recommend approximately 24-26 PSI.
Q: On the trail, how much should I air my tires down to?
A: Typically, I recommend that people air the tires down to about 10~15 psi.