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  #13  
Old 01-24-2015, 05:14 PM
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Well we have some that say 33 and some that say 36 for the same trim level and tires. And I have personally seen one example which is why I asked the question. There is also an older thread in the WK2 wheels and tires section which I found after I posted which provides additional examples.

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  #14  
Old 01-24-2015, 06:01 PM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

I know you guys are talking about the full Grand Cherokee but I have a 2014 Cherokee Limited that came with 18" Continentals. The door placard says 33 psi but that never felt right to me. I have been running 37 psi and that gives me the right handling and ride feel. That new door placard you are talking about of 36 psi sounds about right to me. One more thing, my service manager noticed my tires were showing very little signs of any wear and wondered what I was doing differently. I think the low wear has to do with the slightly increased tire pressure I put in.
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Old 01-24-2015, 06:21 PM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

I agree and have always kept tire pressures a couple psi over recommended. I believe that the longer tread life is due to overall less squirm, less flexing, and the resultant lower heat buildup as well. All contribute to lower rolling resistance, friction, etc.


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  #16  
Old 01-24-2015, 06:49 PM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

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Originally Posted by 46er View Post
HUH? If it had 20's originally mounted and the dealer swapped them for 18's at some point, the door sticker would show 20 pressures. Or is that to complicated for you?
Sure, that's possible.

The thing is, if one can read the inflation pressure on the sticker, one can also read the tire size printed directly above it. The OP made no mention of that.

I'm giving him credit for being intelligent enough to have noted that. You should as well.
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  #17  
Old 01-24-2015, 06:57 PM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

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Originally Posted by CJ8Rockcrawler View Post
It just makes me wonder if the correct stickers were installed or what the correct psi is for each combination.
Mine says 33psi, that's what I use and what is used when it is serviced; I do not see any reason to do otherwise other than bump it up when carrying heavy loads. Perhaps the 36 is using the new Pat's inflation guidelines
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  #18  
Old 01-24-2015, 07:06 PM
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Quote:
Originally Posted by MDBones View Post

Sure, that's possible.

The thing is, if one can read the inflation pressure on the sticker, one can also read the tire size printed directly above it. The OP made no mention of that.

I'm giving him credit for being intelligent enough to have noted that. You should as well.
I did one better. I saw the actual new car sticker. It was indeed born with 18"s.
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  #19  
Old 01-24-2015, 07:23 PM
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Anyway instead of going back and forth on the small stuff what about the issue. 3 psi difference is not the biggest deal in the world but it's something. If I checked my tires and they were off by 3 psi I would definitely adjust them. And if you like to over inflate your tires which number do you use to over inflate them from?
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  #20  
Old 01-24-2015, 08:17 PM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

When I asked this question to my local mechanic a few years ago, his was response was this: He stated that the door placard is the minimum tire pressure required to safely operate the vehicle. Check the max. pressure on the tires and set somewhere between the two and adjust to your comfort .
For example- my door reads 33 and the max in my tire is 44, I set my tire pressure at 37 which is what I've found works best for me.
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Old 01-25-2015, 02:43 AM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

There was another post here a while back where most 2014 Jeep Grand Cherokees produced before sometime in June/July 2013 had 33 PSI on the door and anything after had 36 PSI. Mine is a July 2013 build with 18" wheels and it has 36 PSI on the door.

I usually keep mine at about 38 to 39 when inflating them to account for temperature differences in the morning when cold.
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Old 01-25-2015, 05:53 AM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

33 or 36 on the door placard is the minimum I think, you can go higher as long as you don't reach or exceed the maximum pressure for your tires..

Mine says 36psi, 2014 Overland V8 with 20" and Kumho tires.. 2 months ago I put a new set of Mopar off-road 18" wheels with Yokohama Geolandar ATS tires for the off-roading season and I found the best and most comfortable cold pressure to be around 42 to 43psi which is the average between 36 and 51 (the max. pressure as per the tire manufacturer).. That's for road driving, for off-roading on sand I deflate them to 12psi..
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  #23  
Old 01-25-2015, 07:25 AM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

I've been thinking about this more.

My understanding is that the recommended PSI is always calculated by the factory based on several factors such as weight of the vehicle and load rating of the tires installed.

According to the build list, there are 2 different sets of 18s available on the Grand Cherokee. Is this true? I only see references to Michelin Latitude Tour. Is the 33 PSI door sticker a $595 option for the same tires? My 2015 CRD Limited with 18s supposedly have the optional "P265/60R18 BSW AS On/Off-Road Tires" as opposed to the standard "P265/60R18 AS On/Off-Rd Low Roll Resist Tires." It would stand to reason that since the recommended PSI is calculated by vehicle weight/equipment and the tire weight rating. My theory as to why we are seeing the discrepancies is that there are 2 sets of 18s each with a slightly different load rating and thus a different recommended PSI from the factory.

My Michelin Latitude Tour tires are rated at 2271 lbs at 44 psi. My Jeep came with the 33 PSI sticker.

Motortrend lists the curb weight as 5401 lbs. 52%/48%, Front/Rear for reference.
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  #24  
Old 01-25-2015, 09:12 AM
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Re: Different Tire PSI Recommendation 2014 vs. 2015

Quote:
Originally Posted by CJ8Rockcrawler View Post
I've been thinking about this more.

My understanding is that the recommended PSI is always calculated by the factory based on several factors such as weight of the vehicle and load rating of the tires installed.

According to the build list, there are 2 different sets of 18s available on the Grand Cherokee. Is this true? I only see references to Michelin Latitude Tour. Is the 33 PSI door sticker a $595 option for the same tires? My 2015 CRD Limited with 18s supposedly have the optional "P265/60R18 BSW AS On/Off-Road Tires" as opposed to the standard "P265/60R18 AS On/Off-Rd Low Roll Resist Tires." It would stand to reason that since the recommended PSI is calculated by vehicle weight/equipment and the tire weight rating. My theory as to why we are seeing the discrepancies is that there are 2 sets of 18s each with a slightly different load rating and thus a different recommended PSI from the factory.

My Michelin Latitude Tour tires are rated at 2271 lbs at 44 psi. My Jeep came with the 33 PSI sticker.

Motortrend lists the curb weight as 5401 lbs. 52%/48%, Front/Rear for reference.
Sounds like this may be the answer; I have the Michelins @ 33psi.
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