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Old 10-16-2013, 05:40 PM   #1
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Tire Pressure 35/12.5R18

what pressure is appropriate for on/offroad?
size: 35/12.5 on 18"
Tire: BFG MT KM2
at the moment I have 43PSI for road use. Is that too high?
for offroad approx. 20PSI dont want the tire slip on the rim...

any hint is helpful

btw: it´s a JK 4dr

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Old 10-16-2013, 10:50 PM   #2
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On my 01' TJ with 33X12.5r15 Duratracs I run 25 psi. The shop that put them on had them at 35 but I started to notice that only the very middle was in contact with the road. My uncle (who was a mechanic for 20+ years and who also happens to own a badass CJ-7) recommended that I drop the pressure to 25. I've noticed that more of the tire is in contact with the road and it also resulted in a smoother ride.

That's just what I run them at and they seem to be wearing well. I just rotated them for the first time and they're looking good.

Hope this helps

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Old 10-16-2013, 10:52 PM   #3
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25 psi is on road use btw..

Haven't done much off-roading with them yet but
I haven't aired then down for the mud
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Old 10-17-2013, 07:40 PM   #4
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whow... 25 PSI sounds really low since I run at 43, what may be too high, though
wearing looks good at mine so far
is there any source to get an "official" recommendation?
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Old 10-17-2013, 08:01 PM   #5
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I couldn't find any source to get an official recommendation however I did find something that Jerry wrote in another thread here

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And here's something another guy said in the same thread



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Old 10-17-2013, 08:03 PM   #6
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Old 10-18-2013, 09:42 AM   #7
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I wrote a mail to BF Goodrich westerday. Honestly, I don´t expect an answer.
There are many advices to run the correct pressure, what happens if too low, what if too high, but nothing absolutely nothing where you can find tha appropriate setpoint.

Well, I gues everybody has to find the best settings for HIS individual vehicle, vehicle weight, tire brand, tire type and tire size.

Thanks so far.
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Old 10-21-2013, 07:25 PM   #8
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got answer from BFGoodrich

Quote:
Originally Posted by BFGoodrich Consumer Care

Hello Christian,

Thank you for your email. We welcome the opportunity to serve you.

In regards to the email you sent stating:

---------------------------------------------------------------------
what is the recommendet pressure for 35-12.5/18 on a Wrangler 4dr for in-road purpose?
can't find any info on your site so far. how low can I go for offroading?
---------------------------------------------------------------------

The best air pressure recommendation for the original equipment size tires is to use the inflation pressure as specified by the vehicle manufacturer which can be found on the placard located on the driver’s door jam or in the vehicle owner’s manual. They have determined the optimal inflation pressure for load, ride, handling, rolling resistance and treadwear performance.

Maintaining correct tire inflation pressure helps optimize tire performance and fuel economy. Correct tire inflation pressure also allows you to experience tire comfort, durability and performance designed to match the needs of your vehicle.

If your vehicle has a different size tire than what was specified by your vehicle manufacturer, it is important that the tires be inflated to provide the same load capability of the original tire size at the manufacturer’s recommended pressure. We will need to know the new tire size you are considering , your original equipment size tire and the vehicle manufacturer’s pressure recommendation for the front and rear tires. Please contact us by email or you can call us at the number listed below and we will be happy to determine the appropriate air pressure.

BFGoodrich 1-877-788-8899

Christian, we appreciate your business and thank you for choosing BFGoodrich.

... and so on and so on
I transmitted the datas from my Wrangler and we will see, what the answer will be
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Old 10-21-2013, 10:10 PM   #9
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That's cool that they got back to you. Curious to see what the answer will be
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Old 11-06-2013, 11:12 AM   #10
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Old 11-07-2013, 07:29 AM   #11
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they actually came back to me and CALLED me to answer my question.
After I 3 times confirmed what the sticker on my door says (43psi), I was pushed in a waiting loop. ... and I waited ... and waited ... and waited ... and listened to the music ... and waited .. and listened .... after quite a while I quitt.
Never heard anything again... :-(

at least ... the good will counts
or
nice try but no success

now I´m on 35psi for road and will try 20 offroad next time :-)
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Old 11-07-2013, 09:03 AM   #12
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I chalked the 35" Toyo Open Country ATII's I have that are 12.5" wide on 9" wide rims. I found that around 31 psi the chalk on the very edges of the tread was rubbed off nearly as quickly as the center so I figure 30-31psi is a pretty decent level for my tires on my Jeep at it's curb weight.

Basically I started at around 42psi in all tires, rubbed a piece of children's white sidewalk chalk over a full row of tread blocks in-board to out-board. Drove down the street 50-75ft and checked where the chalk wore away. Initially there was about 2 inches of chalk on the out tread blocks while the center was brushed off. I lowered PSI about 3psi and repeated until I got to about 31 where I felt the edges were brushed off nearly as fast as the center. Figure I had a half tank of fuel and only me so with more fuel/people/gear I would get a full contact patch and I wanted to err on the side of having a hair too much air then not enough and have the edge tread blocks wear faster then the center.

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