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Old 02-12-2011, 04:16 PM   #1
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suggested tire pressure for 33s

I finally got my 33s and new wheels on, yeah!!

but have one question, what is the suggested pressure for a 33 tire while road driving? I know the tires can go as far a 50psi but that doesn't sound like a good idea either. The tire shop installed them @ 35psi. Is this the best pressure for road or not?

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Old 02-12-2011, 04:27 PM   #2
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depends on your jeep JK/JKU, your jeep use-DD/off-road/freeway/mall/carry load/tow trailer--lotta variables

Also depends on tread pattern A/T---M/T--Slick--

My JKU that I tow with and not a DD I run my LT295/75x16 Hankook Dynaprio M/Ts at 28 psi--they're load range "D"

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Old 02-12-2011, 04:29 PM   #3
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35 psi sounds about right but to be sure, need to know the exact information. What brand, is it A/T's or M/T'. Are they 15, 16, or 17 and what is the load rating

Example: Goodyear MT/R w Kevlar 33X12.5X17 Q118 is 35 PSI
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Old 02-12-2011, 04:32 PM   #4
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Quote:
Originally Posted by makotoshishio View Post
I finally got my 33s and new wheels on, yeah!!

but have one question, what is the suggested pressure for a 33 tire while road driving? I know the tires can go as far a 50psi but that doesn't sound like a good idea either. The tire shop installed them @ 35psi. Is this the best pressure for road or not?
I've heard different answers for this. I used to work as an installer/aligner at sears auto and was always told just because a tire has a max psi that you don't have to put that much in it. That is why there is a sticker on the door. However, that is for the size specified for that vehicle so I really can't tell you. I would run it with 35psi and see how smooth the drive is and watch the wear pattern. If it wears on the outsides of the tire then you need more air. If it wears in the middle of the tire you are running too much air. Just a thought.
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Old 02-12-2011, 05:03 PM   #5
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Here is my tires info.

Dick Cepek Mud Country 33/12.5R17 load range is D

I will drive mostly on the highway to go to work, some weekends for offroad fun.

My ride is a JK 4 door. Not towing anything not extra weight such as heavy cargo or heavy mods (bumpers, skid plates or other stuff)
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Old 02-12-2011, 05:12 PM   #6
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Kewl, probably 32/35 psi and rotate em every oil chg--


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Originally Posted by makotoshishio View Post
Here is my tires info.

Dick Cepek Mud Country 33/12.5R17 load range is D

I will drive mostly on the highway to go to work, some weekends for offroad fun.

My ride is a JK 4 door. Not towing anything not extra weight such as heavy cargo or heavy mods (bumpers, skid plates or other stuff)
Like I said, mine isn't a DD, so I keep mine at 28psi front, 26psi back, but they're a little more aggressive than your Dick Cepeks and 90 % 0f my driving is in the Nv desert !!

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Old 02-12-2011, 05:28 PM   #7
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Ok thats a 121Q with a Max cold PSI of 50 PSI which means 35 PSI is the recommended PSI. You can run it a little lower if you are worried about comfort (32 psi should be safe) but it will cost a little MPG's to do so. The JK stock that runs a Q tire is 112Q at 37 PSI. As the load index goes up the PSI goes down so since yours went to 121 then PSI goes down by 9. But in the class of tire you use your PSI should not go below 35 PSI so you set it to the minimum setting of 35 PSI because at highway speeds lower PSI in that class of tire could lose it seal in a hard turn at high speed.

Even though it should be safe to run lower PSI most tire shops will not go below the minimum PSI standard so you can't come back later and say hey they put in 30 PSI and my tire lost its seal and I wrecked. I will sue them.

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