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Go Back JeepForum.com > General Technical Discussions > Tires & Wheels > 31s make much of a difference?

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Unread 02-17-2013, 03:10 PM   #1
RudeBoyNallin
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31s make much of a difference?

i have a stock wrangler tj on 30s and everytime i go offroading/mudding i get leaks in the tires. im thinking to upgrading to 31s with better tread with a 2 inch lift or so. does it make much of a difference? it seems like a lot of money for something not that significant

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Unread 02-17-2013, 03:13 PM   #2
threeb
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It does make a difference. You could skip the lift or go with a 1" or 1.25" BL it will be used down the road for other mods and you can decide what you really want out of your lift and jeep.
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Unread 02-17-2013, 03:33 PM   #3
RudeBoyNallin
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okay thanks. the guy at the shop said i have to go with like a 2.25" lift to clear them thatll be like 300 bucks. is he trying to rip me off?
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Unread 02-22-2013, 10:20 AM   #4
Labhound
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I have 31's on mine with stock suspension and gearing, it does good and rubs only on tight slow turns. I may go the cheap route and do a 1.25" bl with 3/4" shackles.
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Unread 02-22-2013, 10:28 AM   #5
hustler905
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If you need new tires anyway, then get 31s. If you're going to want bigger later then just wait for 33s.

A 1.25" BL should clear 31s no problem.
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Unread 02-27-2013, 12:08 AM   #6
tjtrucker
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I had 30s on mine and thought about going to 31's, the tire size isn't much different. so I did the 2.25" BBL and went with the Goodyear Duratracs 33x12.50x15. they run small and actually measure 32x11.50x15, here's how mine looks
20121224_15.jpg  
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Unread 03-01-2013, 12:28 PM   #7
bisco1
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Quote:
Originally Posted by tjtrucker
I had 30s on mine and thought about going to 31's, the tire size isn't much different. so I did the 2.25" BBL and went with the Goodyear Duratracs 33x12.50x15. they run small and actually measure 32x11.50x15, here's how mine looks
I just put in a 2.25 BB it seem like everyone suggests only 32s however I want 33s...how is this running? I was looking at the bFGood A/Ts 33x10.5... Any thoughts?
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Unread 03-01-2013, 03:43 PM   #8
nsaia
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I have a 2005 tj with stock suspension and have no issues with 31s. So much so that I'm actually looking at 32s.
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Unread 03-02-2013, 07:36 AM   #9
tjtrucker
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Originally Posted by bisco1 View Post
I just put in a 2.25 BB it seem like everyone suggests only 32s however I want 33s...how is this running? I was looking at the bFGood A/Ts 33x10.5... Any thoughts?
Mine are sold as 33x12.50x15. That's what is stamped on the side walls, but as with many tires the actual size differs from what the tire is sold as. Just like the BFG T/A KO 33x10.50x15- is actually 32.7x 10.6x15, once you put it on an 15x8" rim and lower the air pressure to the proper psi you'll prolly get a 32x 9.5 or 10 x15 out of it. you can get the actual sizes from most tire manufacturer's websites, and you can get it from tirerack.com too.

Mine run fine, I suggest you put the proper size bump stops to keep the tires out of the fenders during flexing when off road. on road and on wooded trails/sand No problems. I actually used the 2.25" spacers in the front and also put in a .75" Spring Isolator pad, thus giving 3" up front and 2.25" in the rear. I am considering a 1.25" body lift also.
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Unread 03-02-2013, 07:51 AM   #10
tjtrucker
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Quote:
Originally Posted by nsaia View Post
I have a 2005 tj with stock suspension and have no issues with 31s. So much so that I'm actually looking at 32s.
You'll need a lift of some sort for the 32s. Here's a pic of the 33x12.50x15 (actual 32x11.5) GY Duratracs, next my old BFG T/A KO 30x9.50x15 before I put the 2.25" BBL on.
100.jpg  
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Unread 03-02-2013, 10:52 AM   #11
nsaia
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Quote:
Originally Posted by tjtrucker View Post

You'll need a lift of some sort for the 32s. Here's a pic of the 33x12.50x15 (actual 32x11.5) GY Duratracs, next my old BFG T/A KO 30x9.50x15 before I put the 2.25" BBL on.
Thanks. Remember that the center of the 30 is lower than the center of the 32 so the fender itself will be higher with the 32 installed. And that the 32 may actually be smaller in diameter than 32. I was amazed how much clearance I had when I installed the 31s. I'm working with the tire dealer and have a set of 31s selected as backup in case of rubbing.
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Unread 03-02-2013, 12:34 PM   #12
tjtrucker
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The backspacing will affect the rubbing issues aswell. My stock Gambler wheels had 5.5" of backspacing. I ordered my Duratracs mounted on Dick Cepek DC2 wheels they have 3.65" backspacing, this keeps the front tires from rubbing when the steering is turned full left or right, and keeps the rear tires from rubbing the rear spring perch/inside wheel well- as shown in the pic.
springpearchgap01.jpg  
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Unread 03-14-2013, 09:25 AM   #13
rbBrighton
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Quote:
Originally Posted by tjtrucker
The backspacing will affect the rubbing issues aswell. My stock Gambler wheels had 5.5" of backspacing. I ordered my Duratracs mounted on Dick Cepek DC2 wheels they have 3.65" backspacing, this keeps the front tires from rubbing when the steering is turned full left or right, and keeps the rear tires from rubbing the rear spring perch/inside wheel well- as shown in the pic.
Is the picture that you are showing with the 3.65 backspacing?

I am thinking about doing a 2 inch BDS with 33*12.5*15 Duratracs on 3.75 backspaced wheels.
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Unread 03-18-2013, 08:49 PM   #14
tjtrucker
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No it's not the 3.65. I found it online, I think it's a stock wheel, closer to the 5.5, I'll post apic of mine when I get back home (at work right now)
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