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Old 08-01-2011, 04:42 PM   #1
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Default correct tire pressure

I switched to a 30x9.50x15 bfg all terrain on my stock 2000 cherokee. I mounted them down at the shop and put 35psi in them for now. what should the correct tire pressure for daily driving it on the road be?
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Old 08-01-2011, 04:43 PM   #2
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35 psi is normal. That is what mine are at.
It really depends on the tire too. Read the sidewall and it will tell you what psi to run.

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Old 08-01-2011, 04:45 PM   #3
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I run 30 on the roads and bout 18 in the trails. But yeah like jmm said 35 will do
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Old 08-01-2011, 04:48 PM   #4
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If you look inside you door there is a placard with tire pressure info on it. The new tires will carry more air pressure than you need on your xj because they will fit on a lot of different vehicles which all weigh different. You can start with what it says and adjust from there depending on what you like in your ride feel or the weight that you might carry. If you see tire wear on both outside edges the air is too low for what you weigh. Too much wear in center the too much air.
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Old 08-01-2011, 08:16 PM   #5
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I run 35 PSI on my LT235/75R15 tires and they do fine.
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Old 08-01-2011, 09:06 PM   #6
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Drivers door is for stock tires. Although 30s aren't much bigger 33-35psi is fine. One way I've heard to test from a few ppl is to chalk your tires left to right on the thread and drive. If the chalk wipes away from center you're under inflated, if chalk goes away from sides you're over inflated
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Old 08-01-2011, 11:34 PM   #7
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Yes it is for stock tires but the same rules apply even if the tire is larger. I run 36's and have a lot of added weight and i only run 27 to 30 psi on the road and tire wear is fine and i get close to 45 k before i change out tires. Along with the fact i have been in the tire industry for about 17 yrs or so. Thats why i said a starting place and fine tune his ride quality from there. The jeep weighs the same the tire got bigger and holds more volume but does not mean it needs more psi to hold up the jeep. So many ppl run 50 psi cuz the tires says so on the sidewall but all that does is wear the center out if the vehicle does not weigh enough to call for that much psi. I am not trying to argue but for all those years i have never had a customer come back with a tire issue due to the advise on tire pressure.
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Old 08-02-2011, 02:07 AM   #8
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Chalk em.
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Old 08-02-2011, 02:08 AM   #9
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Quote:
Originally Posted by sycoglitch
Drivers door is for stock tires. Although 30s aren't much bigger 33-35psi is fine. One way I've heard to test from a few ppl is to chalk your tires left to right on the thread and drive. If the chalk wipes away from center you're under inflated, if chalk goes away from sides you're over inflated
Actually for gas mileage you want to run a little in the over side.
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Old 08-02-2011, 06:05 AM   #10
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wow. my 36 inch tires are made for more of a unimog size than a jeep. i only run 19psi on the road and between 3 and 9psi on the trail.

if i were to run 30's on my jeep, i'd start at around 28-30 and go from there. stock tire size would be around 32 to 35.

my 33's on my tj are at about 25psi. any more and it's a rough ride. feel every pebble on the road. and train tracks......

like said, you can do the chalk thing. if the chalk wears away in the center, too much air. the sides, too little air. but again, it all depends on the tire.
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Old 08-02-2011, 07:47 AM   #11
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Quote:
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wow. my 36 inch tires are made for more of a unimog size than a jeep. i only run 19psi on the road and between 3 and 9psi on the trail.

if i were to run 30's on my jeep, i'd start at around 28-30 and go from there. stock tire size would be around 32 to 35.

my 33's on my tj are at about 25psi. any more and it's a rough ride. feel every pebble on the road. and train tracks......

like said, you can do the chalk thing. if the chalk wears away in the center, too much air. the sides, too little air. but again, it all depends on the tire.
Caged is correct on the air pressure and the way the chalk would wear off...Tj
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Old 08-02-2011, 08:00 AM   #12
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Quote:
Originally Posted by sycoglitch View Post
Drivers door is for stock tires. Although 30s aren't much bigger 33-35psi is fine. One way I've heard to test from a few ppl is to chalk your tires left to right on the thread and drive. If the chalk wipes away from center you're under inflated, if chalk goes away from sides you're over inflated
Backwards.
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Old 08-02-2011, 09:55 AM   #13
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Yes the chalk works good. That way its adjusted to what your jeep weighs with what you have in it. The more you go on the higher side will get better mileage but you will feel every bump. Lower will lose mileage but will be smooth. If i run below 25 on the street i get real bad mileage and it runs a little warmer than i like and as its not a trailer queen just yet it sees a lot of hwy/street driving (tranny is out in my grand).
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Old 08-02-2011, 11:54 AM   #14
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Quote:
Originally Posted by goalieman24 View Post
Backwards.
ty i cant believe i didnt catch that before i sent it
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That's way over my pay grade.
Quote:
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Lol.....wait,we get paid for this?
Quote:
Originally Posted by Lowrange2 View Post
Exactly.

MY JEEP BUILD:

http://www.cherokeeforum.com/f46/pro...ection-104131/
HOW TO SEAFOAM:
http://www.ls1tech.com/forums/genera...-your-car.html
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Old 08-02-2011, 12:14 PM   #15
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i got 31X10.50 bfg all terrains. during the summer when i do more wheelin i run 25-30 normally and when i do harder wheeling i air down to 15-20. during the school year (when i drive 70 miles a day on the highway) i rune them at 35. better milage and smoother ride. tends to do better in snow as well.
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