Tire Pressure for 33x12.50 and Tire Size Question - JeepForum.com
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post #1 of 25 Old 05-12-2007, 01:30 PM Thread Starter
blackout00
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Tire Pressure for 33x12.50 and Tire Size Question

Hey guys have 2 questions.

1.What tire pressure do you run in your 33's for street use? Please let me know.

2. Will 35 x12.50 tires fit under my 00 TJ Sport with 3 " Teraflex Lift? I think I am fine but just want some other thoughts! As always, Thanks!

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post #2 of 25 Old 05-12-2007, 01:52 PM
Jonny Jeep
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tyre pressure depends on what tyres and the setup of your vehicle. you will get loads of answers. for example I run 18-20 psi street pressure in my 33" MTRs

Online factory service manuals and parts lists - http://www.jeep4x4center.com/knowledge-base/index.htm
If it doesn't work properly, look for the service manual link at the bottom of the page.
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post #3 of 25 Old 05-12-2007, 01:54 PM
$lick
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30 psi on my BFG A/T 33 1250's and no 35s would not be logical with a 3 inch lift.

1997 Wrangler 2.5L 5spd

Suspension specs:
RE 3.5, 1.25 JKS BL
Old Man Emu shocks
Teraflex adjustable front trac bar
JKS Disco's
Axle specs:
Dana 30- Superior 4.88's
Detriot tru-trac locker
Dana 35- Superior 4.88's
Riding on:
33x12.50 BFG A/T
Black Cragar soft 8's
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post #4 of 25 Old 05-12-2007, 02:16 PM
Jerry Bransford
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For 33" tires, 28 psi is a good street pressure that will insure your tires wear properly.

No, a 3" lift is not enough for 35" tires, not even close.

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post #5 of 25 Old 05-12-2007, 02:21 PM
BluesMan
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33x12.5 BFG MT at 28. I have not chalked them yet to see if it's the best choice.

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post #6 of 25 Old 05-12-2007, 05:04 PM
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im @ 28 psi currently. id say 24-28 is a good pressure to try out..i will probably try 26 when im bored enough to mess with it.

2003 TJ - 4.0 - 5 speed - Fabtech front bumper - ORfab rear bumper - SYE - RE 3.5 lift - EGR flares - Ridgid toolbox - 33x12.5 Mickey Thompsons
1988 Samurai - 1.6 - 5 speed - 6" lift - lockrites front and back - 8000 lb. winch - 31x10.5 pro comps - 6.5/1 transfer case - onboard air - dual batteries - etc. etc.
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post #7 of 25 Old 05-12-2007, 05:25 PM
1BadJeepX06
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I run 28 PSI in my 33" BFG's...

DH

Coming soon: 2000 Jeep Sport (modifications soon after) :-)
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post #8 of 25 Old 05-12-2007, 05:34 PM
orangetj05
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30 psi 33x12.50 bfg muds

2005 TJ 5.7 HEMI, Caged, Locked, Long armed, Stretched, Air shocked, Cromoed, Running 37 Irocks
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post #9 of 25 Old 05-12-2007, 11:32 PM
chobeegators
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I just read in JP magazine that if you chaulk your tire then run it down the road a little ways you can tell if your over inflated, under inflated or at the right pressure. Depends on how the wear pattern is. Hope that helps.
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post #10 of 25 Old 05-13-2007, 12:43 AM
Difranco
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Pressure is going to depend on the make/model of tire and the weight of your Jeep.

http://www.jeepforum.com/forum/showt...=tire+pressure

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post #11 of 25 Old 05-13-2007, 12:49 AM
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I run 24 in my MT/r's and physically 35's will fit but will rub off road. For pure street use, they will work but so does a Civic.

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post #12 of 25 Old 05-13-2007, 09:37 AM Thread Starter
blackout00
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Thanks for all the good answers. I guess I am going to stick with 33" tires. I also am running about 28 psi in the tires now. Thanks again....keep them coming if you have more suggestions.
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post #13 of 25 Old 05-13-2007, 11:36 AM
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I'm running 33" BFG Muds on 15X10's and I keep 'em at 30 PSI for the street and they're wearing excellent. Never done the chalk test but like I said they're wearing fine. I actually bumped 'em up to 35 PSI yesterday and it cruises awesome now. Gona have to chalk 'em though to see if it's affected the wear pattern.

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post #14 of 25 Old 05-13-2007, 06:46 PM Thread Starter
blackout00
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Great thread. Like the formula. I am running 28 now...seems a bit stiff. Going to go back down to 26 and see how that works. Thanks again for everything!

Quote:
Originally Posted by Difranco
Pressure is going to depend on the make/model of tire and the weight of your Jeep.

http://www.jeepforum.com/forum/showt...=tire+pressure
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post #15 of 25 Old 05-13-2007, 07:14 PM
CB3
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My Answers:

1) I have 33 X 11.3 tires and by much testing and trial and error, I've established that they run best at 29 psi cold pressure tested in morning before driving. The local tire stores and also some online guys say they should run with 28 to 30 psi for my tires and vehicle weight (LJ Rubi). At 28 I get to much body roll. At 30+ it rides to rough. So 29 seems a good compromise for my 33 X 11.3 tires. Now your tires are wider, so I'd guess they run better at about 1 psi less than mine (just a guess).

2) I don't see how you could possibly fit 35 tires, unless you got the Highline Body Kit from AEV installed, which lifts and enlarges the fenders so that you can take 33" tires with no lift, 35" tires with 2" lift, or 37" tires with 3" lift, according to what users of that product have told me. Other than this kit, I don't see any way you're getting 35" tires on a Jeep with a 3" lift. AEV also sells wheels that are made to fit 35" to 37" tires on Jeeps with their Highline body kit and a 2" or 3" lift.

Also, the proper tire pressure partly depends on the relationship of wheel width to tire width. With an 8" wide wheel and a 33" x 12.5" tire, 28 psi sounds correct, but I run 29 psi cause my tire is 33" X 11.3" wide on an 8" rim.

If the rim were wider, say a 10" rim, then you could run a bit more pressure and still have a flatter foot print for better wear and street traction. So if you have a 10" rim with a 33 X 12.5 tire, then 30 psi, or perhaps even a bit more, is appropriate. The flatter footprint and higher tire pressure is why a wider rim in relation to the tire is better on street for street performance and fuel economy. This according to a couple of local tire stores in my area, and also what a wheel manufacturer tech told me on the phone.

However, the narrower rim holds a bead better when aired down off-road, as many at this very site have said many times.

We aren't making street rigs here, but I'm also not making a dedicated off-road rig either. I want the best all purpose, versatile, on and off road result. So that's one reason I prefer a medium width rim (like a 9" wide) cause then I can get a nice compromise between on and off road performance. Another reason I like a medium width rim is cause it suits my medium width tire preference (also for versatility).

Anyhow, the best tire pressure depends partly on tire size and vehicle weight. It also depends on the rim width, and depends on the load range of the tire. A higher load range tire on the same vehicle is a stiffer tire with stiffer side walls. So less air would probably be desirable when tire has a higher load range.

I think that for most Wranglers, a load range D tire is most appropriate. However, for anyone wanting the very most tear resistant sidewalls, then load range E. Personally, I'll stick with D because it rides smoother and is lighter weight than E. I don't care for load range C tires because I think the side walls are to wimpy even for trail use. However, my trails are wild. So maybe my view is skewed there.

Last edited by CB3; 05-13-2007 at 11:33 PM.
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