Tire pressure for bb with 245/75/16 - JeepForum.com

 
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post #1 of 8 Old 07-18-2013, 12:36 PM Thread Starter
snowman91
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Tire pressure for bb with 245/75/16

I have a 2" bb and bigger tires (245/75/16) on and I was wondering what I should set the psi to for good gas mileage. I'm getting roughly 12.5 in the city.

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post #2 of 8 Old 07-18-2013, 01:03 PM
jserna
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Start with 33-35psi.
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post #3 of 8 Old 07-18-2013, 02:16 PM
cubalz
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12.5 mpg in town sounds about right.....

2003 Rubicon - 33x12.50x15 GY Duratracs, 15x10 MT Classic Locks, 2" BL, 2" BB, Warn Front Bumper, Garvin ATS Rear Bumper, Body Armor Extreme Rock Rails, Nth Degree Tummy Tucker, Skid Row Engine, LCA and Gas Tank Skid Plates, Teraflex Quick Disco's, Uniden Pro 520xl CB, 3' Firestik Antenna, BW Flat Fender Flares, Tom Woods DS, Currie Rear Adj Arms
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post #4 of 8 Old 07-18-2013, 04:00 PM
gatorchin
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Yeah..probably not gonna get much better

00' Laredo w/4.7, 2.5/2" fat bobs coil spring lift, front 3/4" spacer, bilsteins 5100's from Kolak, rear addco w/greasable bushings, 245/16/75 treadwright wardens, 247>242 transfer case swap, all control arms replaced with aftermarket, and lots more $ into various parts
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post #5 of 8 Old 07-18-2013, 04:35 PM
Snafe
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Go with what is recommended by the factory. Any higher or lower will either cause safety issues, or unintentional wear. You can get better mpg with higher psi, then it feels like you're driving on rocks, and increase risk of blowout.

Honestly, I'm not a mechanic, but I learned this one from Mythbusters! (If I had to believe anyone on TV, it would be them) :P

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post #6 of 8 Old 07-18-2013, 04:38 PM
Planetcat
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Depends on the max inflation rating of the tire and the load rating. I had load range E BFG KM2's in 245/75r16 that I ran at about 22 because they were so stiff. As a rule of thumb, I usually go anywhere from 2-5 psi below the max on my car and truck. Usually a couple psi higher in the front due to the engine weight.

2004 WJ 4.7L, 1959 CJ-5, 1990 XJ Limited (sold), 1996 XJ (sold), 1989 YJ Wrangler 4.2L (Sold)
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post #7 of 8 Old 07-18-2013, 06:03 PM Thread Starter
snowman91
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Quote:
Originally Posted by Snafe
Go with what is recommended by the factory. Any higher or lower will either cause safety issues, or unintentional wear. You can get better mpg with higher psi, then it feels like you're driving on rocks, and increase risk of blowout.

Honestly, I'm not a mechanic, but I learned this one from Mythbusters! (If I had to believe anyone on TV, it would be them) :P
I would go by recommended but I'm running a bigger size tire so it's not factory.
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post #8 of 8 Old 07-18-2013, 06:04 PM
the88thpianoman
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You're leaving out the most important information: what kind of tires do you have?

2003 WJ in Jeep Green Metallic, 4.0/242/4.10's. 4" Teraflex springs w/ RE monotube shocks and IRO short arms, cheap intake w/ amsoil filter, 2.5" hi flow cat and back exhaust, lots of lights and other misc crap.

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