Because I'm on 31s.The more air you let out the lower your Jeep will sit meaning less ground clearance.

 

Agreed with Troy. I run 35 normally in my 31s and about 18 on the trail because even though most people say it won't blow the bead, I'm still weary of this being that I gotta drive it home from the trail too lol

 

47psi holey freaking hell !!
as mentioned, the xj is fairly light, so don't go by what's on the sidewall, unless you drive a loaded 1 ton. lol.

you can do the chalk method, but with no idea in mind, it may take a while to figure it out.

when i ran 33's, i had them around 22psi for the road and 12 on the trail with an 8 inch rim.

if i had 31's, i'd probably run them at about 26psi.

now with my 36's, i run 12 on the street and 2 on the trail.

 

Thanks

HOLY !@#$! Seriously?

 

2 lbs with locks no problem, lowest I've ran without Bead locks is 4 in the rear 5 in the front.

 

I run 40 psi on street. 15" wheels have so much sidewall they still ride nice and the high pressure makes for less wear and rolling resistance. Off road, I air down to 28 or 30..still enough to expressway home...but I don't do anything wild with it offroad. Just two-tracks, snow, etc.

 

yup, but my 36 inch iroks are bias 6ply sidewall and are made for lower air pressure. any more than 12 and it's rough as hell.

and yeah, with locks i can actually go down to 0psi.

 

0 is possible with locks, although a friend I wheel with in the snow lost a tire when he was running inter airlocks on 37s

 

I read in a 4x4 mag that to find the right pressures for different temperatures, loads and conditions you take front and rear pressures cold, and then again immediately after at least 20 minutes at highway speeds or more and there should be a 4 psi increase. If there is more than 4 psi, than you had too little to start with and if there is less than 4 psi, then you had too much.

 

I wheel with a guy that runs 47s and doesn't even use valve stems in the wheels, says he doesn't need them.

 

Don't know about running without stems but I know guys who pull their valve cores.

 

Paco182, sounds interesting, would probably work great on a car that does pavement. On something I drive both on pavement, and air down for rocks and snow, I think you would be doing a lot of air checks.

 

Rock,
It's supposed to find the ideal pressure for the load you'll have on a frequent basis. One would only have to do it once, get a base line so to say. Air down for the trail, then return to base for the road.

 

How do you put air in the tires? or doesnt he?

 

More than likely it's a bias ply tire and they don't even need air if they're using bead lock wheels