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Old 08-03-2009, 08:25 AM   #1
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Question 31's or 32's?

I'm gonna put a spring lift on my TJ and I'm looking at 2 different tires....One is a 31X12.50X15, the other is a 32X11.50X15. I want to use 15 inch wheels, would you give up an inch of height for a little more stability?

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Old 08-03-2009, 08:39 AM   #2
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are they the same tread pattern? chances are there very similar in size. how big of a lift are you putting on your jeep. and what back spacing are you gonna use? if your going at least 3.5 in then you can run 33s fairly easy

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Old 08-03-2009, 08:59 AM   #3
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1st TJ are very stable. 2nd what width rims you have will play a key role in what size tires you run. Stock you can fit 31x10.50's. For 32's a 2" spacer lift is a good way to go. How do you plan to use the jeep?
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Old 08-03-2009, 12:29 PM   #4
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I would say either 32's or 33's depending on what your doing with it. and what you like
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Old 08-03-2009, 01:57 PM   #5
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chances are there very similar in size.
I'd agree with this. Tires are like condoms - no one wants a small, so manufacturers have been known to exaggerate the sizes.

Even if they are exactly as advertised, I can't imagine that a half inch would make much difference (I'm back to talking tires here). Remember that half the extra size is above the axle, so a 32" tire only lifts you 1/2" above a 31".
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Old 08-03-2009, 04:45 PM   #6
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I'm getting good feedback here guys!

Running 15X10's and a 2 inch coil spacer kit. Looking at the same tire (Pro Comp M/T) either way. I may do a 1" body lift later, but I'll never go above that. I don't do much off-roading perse', but I do hunt and fish alot, and drive offroad pretty much every week. I don't go rock climbing, or mudding, just use it mainly for getting back to the farm ponds and such. I just want my TJ to be "well rounded" and versatile.
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Old 08-03-2009, 05:02 PM   #7
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Oh, you'll be fine no matter which tire or lift you go with.

The TJ is amazingly capable in stock form, except for the stock tires.

You can avoid the whole "arms race" being waged for bigger tires and more flex, and just enjoy driving it.

I'm actually hearing from people who are downsizing their Jeeps because their huge trail rigs are making most trails very boring.

Add a set of rock sliders, and you wo't be scared to go anywhere.
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Old 08-03-2009, 07:40 PM   #8
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also theres no need for a 10 in rim, Stick with the 8 in. Unless you already have them, then no biggie.
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Old 08-04-2009, 01:31 AM   #9
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I run 32x11.5x15's on my 15x8 wheels. Love them and the wide tire look. Wide rims are ugly IMO.
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Old 08-04-2009, 08:41 AM   #10
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I'm getting good feedback here guys!

Running 15X10's and a 2 inch coil spacer kit. Looking at the same tire (Pro Comp M/T) either way. I may do a 1" body lift later, but I'll never go above that. I don't do much off-roading perse', but I do hunt and fish alot, and drive offroad pretty much every week. I don't go rock climbing, or mudding, just use it mainly for getting back to the farm ponds and such. I just want my TJ to be "well rounded" and versatile.
2in spacer lift will get you enough room to stick the 32s under there as long as you run 4.5in backspacing. if you dont have this spidertrax spacers are effective and reasonable priced.

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also theres no need for a 10 in rim, Stick with the 8 in. Unless you already have them, then no biggie.
i to would suggest the 8in rim. ive read many things from perfessionals that say the 8 is preferable to the 10 because if your running a 32. x11.5 you only have 1.5 in of tire wider than your rim subjecting your rim to more damage and a higher likely hood of blowing a bead if you air down. the 8 tho has an extra 2in of natural force on the bead keeping it seated at lower pressure and also the tire sticks out more from the lip of the rim keeping it away from trail hazzards such as rocks.
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Old 08-04-2009, 11:31 AM   #11
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Originally Posted by CudaJimmy View Post
I'm gonna put a spring lift on my TJ and I'm looking at 2 different tires....One is a 31X12.50X15, the other is a 32X11.50X15. I want to use 15 inch wheels, would you give up an inch of height for a little more stability?
1) What size lift???
2) 2" lift or BB will fit up to 32's no problem
3) what gearing do you have? Anything less than 3.73 and you say good by to 5th gear.

I have 32's mounted with 3" lift, full flex I do rub and with 3.73 5th keeps me coasting at 60mph but with little pickup.

Also getting 17mpg highway

Hope this helps
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Old 08-04-2009, 01:30 PM   #12
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I used to have a 2" spacer with 32's MT and worked really good for me and did not need to do any other mods. Only one problem..Soon, you might want to go to 4" with 33's so think about it. I didn't and it did cost me
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Old 08-04-2009, 01:50 PM   #13
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Another thing to consider is 32's are starting to get hard to find... Unless it's just the ones i've been looking at. BFG appears to have stopped making the AT's and MT's in a 32 and can't find some others now either... But you can find 31 or 33 in just about anything still.
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Old 08-04-2009, 02:44 PM   #14
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Another thing to consider is 32's are starting to get hard to find... Unless it's just the ones i've been looking at. BFG appears to have stopped making the AT's and MT's in a 32 and can't find some others now either... But you can find 31 or 33 in just about anything still.

I had Maxxis Bighorns 32's MT radials I am sure they still make them
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Old 08-04-2009, 06:29 PM   #15
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Well I took everyones advise very seriously and here is what I did:


I ordered 4 new Pro Comp Radial M/T's in 31X12.50X15 and a set of 5 of the Black Rock 941 wheels in 15X8. I'll run the standard 2 inch spacer and I may go with a 1 inch body lift later, but not planning on it for now.

Thanks for all the help guys, I DO appreciate it!
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Old 08-04-2009, 07:12 PM   #16
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double tap
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Old 08-04-2009, 09:58 PM   #17
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should work fine.


and if your having trouble finding 32s just run 265x70r16s

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