Originally Posted by rustynail11
I have a 2013 JKU with P245/75R17 Good Year Wranglers. What is the best pressure to run on the road with and what should I air down to when going offroad?
I am new to this so any help would be appreciated.
For running on the road, the best way to figure out tire pressure is to do a chalk test. As for off road tire pressure, most guys will run around 15PSI on a stock set up. If you have bead locks you can go as low as 5-7 PSI, but that's not necessary unless you're doing some hardcore rock crawling on a sticky tire.
Here is how to perform a chalk test.
1. Drive to a flat area. This can be your driveway or the street in front of your house.
2.Draw a thick, straight line across the width of the tire.
3. Drive the car forward at least one-full car length.
4. Inspect the chalk on the ground and on the tire. A tire with the proper air pressure should press the chalk line evenly across the ground. This means you'll see the entire chalk line imprinted on the ground. An over-inflated tire will bulge and only the center of the line will touch the ground. You'll only see a small portion of line if this is the case. If you're tire is underinflated, you'll see only the sides of the lines since the middle of the tire is not making contact with the ground.
5. Adjust your tire's air pressure according to the results.
Let me know if you have any other questions. I'll be happy to help!