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Topic Review (Newest First)
07-07-2011 09:15 PM
freeskier
Quote:
Originally Posted by freeskier View Post
42 PSI is seriously overinflated, borderline unsafe for an unloaded TJ at highway speeds. Not to mention your tires are going to wear HORRIBLY.

General rule of thumb is bigger tires lower PSI. I run my 33x12.5 pro comps at 28 PSI. Based on how stiff of tires they are I could probably go lower.
Woah, I missed the whole second page... nevermind.
07-07-2011 09:12 PM
neverfastenough1 Go with whatever the door jamb says. It is according to the weight of the vehicle not the tire. Mine doesn't have a loaded/unloaded psi. It just says 29psi and that is what they are at.
07-07-2011 09:02 PM
freeskier
Quote:
Originally Posted by bpm54 View Post
Guys, I'm very appreciative for the advice! believe me. However, I'm just saying it drove better on the highway inflated to 42.

And no, I wouldn't blame anything on you for advice, I take responsibility for my own actions. Don't be so judgmental about me, I'm just giving my honest opinion.

I'm getting use to making a transition from a sports car to a jeep. So, Please, be patient with my questioning.
42 PSI is seriously overinflated, borderline unsafe for an unloaded TJ at highway speeds. Not to mention your tires are going to wear HORRIBLY.

General rule of thumb is bigger tires lower PSI. I run my 33x12.5 pro comps at 28 PSI. Based on how stiff of tires they are I could probably go lower.
07-07-2011 08:25 PM
jeep2011mass This who PSI thing confuses me and in all the cars I have owned I have always been confused about this I am hoping that someone can help me understand whats a safe PSI for my tires. I read so much information.. Most of what I read is more so for upgraded wheels and tires so I not sure what appies to me and what doesn't... Help.

I have 2011 Wrangler Sport all stock tires and wheels. The tires are 225/75r16 bsw on/off road tires. They are Goodyear Wrangler SR's. The door sticker says Cold Pressure is 35psi, but when I had them set to that it felt like I was driving on rocks. I could feel everything and hear every single noise the jeep made. So I have been dropping them to over the last couple days. I am at 30psi now and it feels like so much better. However, I do lots of long highway drives and was wondering over time is going to lesson the life of my tires? I would even go a little lower if I know that the tires I have could handle it.. Its only me in the Jeep all the time for the most part and on occasion one other adult and small kids so I can see that maxing out the weight and requiring me to add air. I want the Jeep to ride smoother, but I don't want to make it unsafe.. One more thing how can I tell what size tires I am running meaning 30's 40's etc.. Help and thank you.
03-01-2011 07:34 PM
rrich Sharp things, rocks, glass etc cut a tire much easier if it's super hard.

My 35x12.5's on 8"rims -
Street, 28 lbs
Dirt or Rocky trails, 12 lbs.
Beach sand, sand dunes, 3-4 lbs.
Never have lost a bead yet.

Even at 18 lbs sharp things will cut them.
At 12 lbs, the tire tends to conform to the sharp thing.
At 4 lbs they can cut easy too.

Looking at how much the sidewall deflects doesn't indicate much. At lower pressures they don't really get wider - but the footprint length gets much longer.

Use a knife on your hand - grab the blade with a soft grip. Then grab it with a stiff hand. See which way draws blood.
03-01-2011 05:26 PM
jgorm
Quote:
Originally Posted by InfernoGirl View Post
dstacy, I think you misunderstood that you shouldn't check the pressure in a hot tire. As air heats up it increases the pressure in the tire. Airing down for the beach is fine with a hot tire. And airing up a hot tire is fine, since the air going in is cold. You just won't get an accurate reading on a tire full of hot air...
Most air compressors really heat up the air! sometimes you can't even touch the pump heads without getting burned. If you don't care about a few psi here or there, its fine to air them up at any temp.
03-01-2011 05:13 PM
InfernoGirl
Quote:
Originally Posted by dstacy View Post
Ok so I'm confused. I've always read that you should never let air out of a warm tire yet it sounds like you guys do. So I drive down the highway to the beach, the tires are hot, now what do I do?

dstacy, I think you misunderstood that you shouldn't check the pressure in a hot tire. As air heats up it increases the pressure in the tire. Airing down for the beach is fine with a hot tire. And airing up a hot tire is fine, since the air going in is cold. You just won't get an accurate reading on a tire full of hot air...
03-01-2011 05:11 PM
InfernoGirl
Quote:
Originally Posted by oakdale bob View Post
I've checked every where, and am more confused then when I started. I have a 2010 wrangler, 2-door. Originally it had the original tires and wheels I now have, LT 285/70/R17's. Door label states 25lbs cold. It now has 25lbs on all wheels that the dealer put in. The tires specify 80lbs. The Jeep will mostly be on the road. Normally 2 occupants. So, 16 inch wheels from the factory,17 inch
now. The new ones are Toyo AT Open Country. Thanks for your help!!! Bob- Just remembered, the tire sensors light is on.
80psi!!!!!!! Holy batcrap! Are you sure?

The door label is for stock sized tires. Your tires will need less than 80 psi for sure, since that's the max, but what the heck load range are those things? I just don't even know what to tell you about those things......
03-01-2011 04:55 PM
dstacy Ok so I'm confused. I've always read that you should never let air out of a warm tire yet it sounds like you guys do. So I drive down the highway to the beach, the tires are hot, now what do I do?
03-01-2011 03:18 PM
Rubicon2
Quote:
Originally Posted by oakdale bob View Post
I've checked every where, and am more confused then when I started. I have a 2010 wrangler, 2-door. Originally it had the original tires and wheels I now have, LT 285/70/R17's. Door label states 25lbs cold. It now has 25lbs on all wheels that the dealer put in. The tires specify 80lbs. The Jeep will mostly be on the road. Normally 2 occupants. So, 16 inch wheels from the factory,17 inch
now. The new ones are Toyo AT Open Country. Thanks for your help!!! Bob- Just remembered, the tire sensors light is on.
I'm pretty sure factory pressure for the JK's is 35 psi cold. That 80 psi you see on the tire is the Maximum Cold P.S.I. for the maximum weight rating on the tire. You do not need to inflate your tires to the maximum cold pressure. As light as your Jeep is it would cause some serious middle of the tread wear.
03-01-2011 03:01 PM
oakdale bob
I am totally confused

I've checked every where, and am more confused then when I started. I have a 2010 wrangler, 2-door. Originally it had the original tires and wheels I now have, LT 285/70/R17's. Door label states 25lbs cold. It now has 25lbs on all wheels that the dealer put in. The tires specify 80lbs. The Jeep will mostly be on the road. Normally 2 occupants. So, 16 inch wheels from the factory,17 inch
now. The new ones are Toyo AT Open Country. Thanks for your help!!! Bob- Just remembered, the tire sensors light is on.
09-16-2010 05:35 PM
eweis006
Thanks

I'm a newb to the Rubicons (had my 06 less than a year) and my Wrangler MT/R's were starting to get cupped like crazy!!! The thing was almost undriveable.....So I'm thinking shock absorbers (was just about to buy some,and i still might)...alignment (which I did)....balancing (all tires 2x). And something as simple as tire pressure never even crossed my mind. Sure enough, Fronts were @ 38psi Rears @ 40psi (only fronts were cupped though) Dropped the Fronts down to 31 & Rears to 33, thing drives like a GEM compared to before!!!! Still minor vibration in the wheel from the already formed cups (or just cuz its a jeep) but unbelievable the difference it made. Almost had to trash perfectly good tires.....

Thanks Again!!!!
04-20-2010 08:54 PM
oakdale bob
Finally

My tire pressure light went off. It just took my jeep a lot longer to decide to recognize the new tires & wheels. She's just as INDEPENDENT as the other Jeeps I've owned, but I'm sure you have all been exposed to this type of Jeep behavior. (this is why we love them)
04-16-2010 07:25 PM
03 RUBI Smittybilt makes a nice one (yea, Smittybilt) that runs about $60. It runs off cables. I've had mine a year or so and have had no problems with it. It's model is Superflow MV50.
04-16-2010 09:48 AM
bpm54 Thanks Guys for the info. Should I just search Air Compressor with battery powered hook up? or any brand name come to mind?
04-16-2010 01:15 AM
jdhallissey ^ Yup no worries I am glad you saw it tho! He might of ordered it thinking I sent the right link which I thought I did lol. MY bad good catch!
04-16-2010 01:01 AM
Jerry Bransford
Quote:
Originally Posted by jdhallissey View Post
OOPs wrong one. Sorry Jerry yea get the one with the battery clips on it!
Whoops sorry, I didn't even know that's what you suggested, I wasn't recommending against the cigarette lighter type of compressor in response to your suggestion. I know you know compressors well enough.
04-16-2010 12:48 AM
jdhallissey OOPs wrong one. Sorry Jerry yea get the one with the battery clips on it!
04-16-2010 12:46 AM
Jerry Bransford Avoid any compressor that plugs into your aux power port (cigarette lighter) as they will be painfully slow to refill big Jeep tires. Those that have battery clips (because they pull more amps than an aux power port can provide without blowing a fuse) are far more likely to put out more air volume which is what you need to refill big tires.

Pay no attention to the cheap Walmart or Autozone air compressors screaming about how high of a pressure they can pump to, the tiniest compressors can eventually pump a small tire to a very high pressure if you have a lot of extra time to waste. A compressor that can pump out a large volume of air at a lower pressure is what you need, our tires don't need high air pressures.
04-15-2010 11:09 PM
jdhallissey Costco - AAA DC 12V 250psi Air Compressor
04-15-2010 11:04 PM
jdhallissey You can get the mini clamps like battery cables but smaller. Let me find the link hold up
04-15-2010 10:43 PM
bpm54 I'll pressure them down a bit then over the weekend and give it a go.

No, Costco but a Hell-Mart. Just a basic compressor is what I'm looking for then, perhaps one with jumper cables. Good start man.

Thanks again.
04-15-2010 10:32 PM
jdhallissey Yes I am running at 27 right now. All 4 tires are at that. I have no worry of slipping a bead. I have ran my tires at 8 psi to on the road up to 60 mph and it never slipped either. So turn them down to 25 psi and the jeep will feel a ton better.

To the pump do you have a costco near you? All you need is a simple compressor that is built for DC power. They run about 50 bucks.
04-15-2010 10:23 PM
bpm54 Ok, if it is 1/3 to 1/2, then the 33 recomended is still too high. You had mentioned in pervious post that you keep yours several ponds lower then 33. Perhaps I should creep mine down a bit more?

Also, on my MTR Goodyears I can't find a max pressure listing.

Just a line that mentions max single load and double load and both state (80psi). Any low down on that?

One last question, can you recommend an air compressor that is jeep freindly?

Thanks.
04-15-2010 10:16 PM
Jerry Bransford The tire pressure on tire's sidewall is only there to indicate its maximum safe air pressure and that is to be used only when the tire is supporting its maximum safe load. Our Jeeps are typically only 1/3 to 1/2 of a tire's safe working load so the tire should never be inflated to the pressure indicated on the sidewall for a normal passenger vehicle.

The proper pressure for any particular tire depends entirely on the vehicle weight. The same tire would need to be inflated to different pressures for different vehicle weights... there is no single correct tire pressure for any particular tire or tire size, that (again) depends entirely on the vehicle's weight. That is why the door jamb gives two different PSIs for the tires, the lower of the two pressures is for a lightly loaded vehicle and the higher pressure is used when the vehicle is fully loaded to its max gross allowable weight.
04-15-2010 09:48 PM
bpm54 Sorry for the delay Jerry.

Would that be the max load single and double info? That's the only thing that mentions a psi and both are (80psi).

Yes please continue.
04-15-2010 07:17 PM
oakdale bob THANKS, I'll try that... I've had 4-Jeeps, still gotta luv them...
04-15-2010 06:57 PM
jdhallissey Well then if the sensor is still on just add air til the light goes off. Check it- I am betting it is going to go off at 35 psi. then take it to your dealer and go hey can you reset the psi sensor to 25-28 psi. that way you have some room and also the jeep will ride butter smooth.
04-15-2010 06:51 PM
oakdale bob Thanks for the reply. ALL the tires are at 31psi, including the spare...
04-15-2010 06:09 PM
jdhallissey To the sensor normally it is around 30-33 psi. My mom's tahoe has the same thing well it sucks FYI. As you have seen us say it rides really well and likes it around 25-30 being the max for a jeep since they are not that big. what are your tires set at now and is the light on?
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