Running on 33x12.5 15's with the air set to 30, but the outside treads are not making full contact. How low can I safely go?

 

I've heard it isn't unusual to go as lo as 10/15 on the trail see how the outside looks then. What year is your jk/ did the 15s fit ok?

 

I've got an '11 and there are no issues. I've got the procomp 8069's.

I should have clarified I'm asking about the right pressure when on the road, not trails.

 

Aha I see well now I have no idea, never heard of that. Thanks for the info though and I'm pretty sure you'll get an answer soon I always do.

 

You can safely air down until you have a full contact patch. Get some chalk and run a line across your tires. Drive about 100 yards and get out an look. If there is still chalk, air down a bit more until you get where you drive and there is no chalk visible. Otherwise known as the chalk test.

BTW, on my 37" toyos on 15" wheels, ran 21 front and 19 rear to get a full contact patch.

 

Thanks! I'll give that a try