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Unread 01-09-2013, 10:28 AM   #1
Colt44
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Tire decision: 31 or 33?

I have been needing new tires for my 1983 CJ7 but wanted to wait until I did the YJ spring conversion and knew what the truck's height would be.

It's now done, and I gained about 3" from what it was (and as flat as the original springs were, it's probably only an inch or two over what it would have been with CJ springs).

I was thinking about 31 x 10.5, but I'm tempted to go for 33-inch.
I think there's enough room, I just wonder about the extra size and bulk and what they would do in terms of ride, noise, steering, mileage, etc.

Performance-wise, is there any compelling reason to go with 33 instead of 31?
Especially when this CJ will be driven mostly on pavement, both in-town and on the highway.

Advice? Opinions?

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Unread 01-09-2013, 10:46 AM   #2
Coiz
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I've always loved the way 32x11.50" have looked on mildly lifted jeeps, just seems to be the perfect proportions. Might be the perfect compromise for you.
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Unread 01-09-2013, 11:13 AM   #3
caseypotts
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You can look at what my 31 10.5 look like on my CJ with a 2.5 lift in the post below "No Name" if I was to do it over... I would think a bit more on 32's. Not saying I would do it but I would have thought more on it.
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Unread 01-09-2013, 11:16 AM   #4
oz76
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Hi guys I'm a newbi here but been reading lots and lots of Threads for the past 6 month. I have learn so much! so thank you all!!
I'm not sure but when you go to a 33s or higher would it require Regearing the Dif? I also have a stock CJ7 with 235 75 15 I think they should be about 29s I'd like to go 32s. What do think as far as Regearing the Dif?


ozzie
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Unread 01-09-2013, 11:29 AM   #5
acgcoug
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Quote:
Originally Posted by Coiz View Post
I've always loved the way 32x11.50" have looked on mildly lifted jeeps, just seems to be the perfect proportions. Might be the perfect compromise for you.
Agree, that's what I plan on doing when I get to that point (2.5" spring lift). I currently have 31x10.50" on right now with no lift. See my signature link, there's pics on the first page of my build thread.
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Unread 01-09-2013, 11:33 AM   #6
Destr0
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I really like the stance on mine with the 32X11.5 tires-

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Unread 01-09-2013, 12:17 PM   #7
Bobs85Reny
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I have 32 x 11.5 on mine stock rims and suspension.
photo-119.jpg  
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Unread 01-09-2013, 12:31 PM   #8
ADDZ71
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I had 33 x 12.50 on mine and replaced them with 32 x 11.50 and would agree I think they are the best size for most Jeeps that do limited trail riding / rockcrawling. One point to mention though is the fact that 32's are become pretty scarce. I could only find them in a MT version and no AT's which would have been my preference.
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Unread 01-09-2013, 12:38 PM   #9
jeep714
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I have 32's on my CJ7, I was in between 31's and 33's also, but 32's were a great compromise, and in my opinion I thin they look close to perfect for a CJ7, especially a daily driver.

Peter
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Unread 01-09-2013, 12:53 PM   #10
Matt1981CJ7
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Another vote for 32"/11.50s.

I thought long and hard about 33"s, after my 2.5" OME lift. But, after seeing how tight 32"s were, I was happy with my choice.

Matt
tiretuck1.jpg   tiretuck2.jpg   tiretuck3.jpg   tiretuck4.jpg   tiretuck5.jpg  

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Unread 01-09-2013, 03:43 PM   #11
WindKnot
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Quote:
Originally Posted by oz76 View Post
Hi guys I'm a newbi here but been reading lots and lots of Threads for the past 6 month. I have learn so much! so thank you all!!
I'm not sure but when you go to a 33s or higher would it require Regearing the Dif? I also have a stock CJ7 with 235 75 15 I think they should be about 29s I'd like to go 32s. What do think as far as Regearing the Dif?


ozzie
Hi. Welcome. The answer is....... It depends! If you have a high enough gear ratio you'll have a tough time getting rollingwith the larger tires. The larger the tire, the more it compounds the problem. Assuming you do get your Jeep rolling you will get a higher top speed.

Your best bet at this point is to gather more information. On the rear differential just outside of the cover on the right axle, somewhere underneath the mud and rust, there is a letter stamped. That letter is code for which gears that axle was originally equipped. Get us that letter and assuming your Jeep is stock, we can give you a fairly good idea as to how large a tire you can go with before changing gears.
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Unread 01-09-2013, 03:46 PM   #12
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These are 31s....



Two inch lift.
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Unread 01-09-2013, 04:06 PM   #13
keith460
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Another vote for 32x11.50 on stock rims!

I previously had 33" with stock gears (3.31) and what a dog it was on slight inclines. Now we have 4.10 gears and 32" tires and I couldn't be more happier. The 32" tires fill the wheel wells out nicely and they look like they belong right at home. Not to big, not to small.

Edit: hated the poser shot.
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Unread 01-09-2013, 04:09 PM   #14
Matt1981CJ7
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Keith,

I never get tired of seeing your rig.

Didn't you have to switch from a 4 to 5-speed, with your 4:10 gears, to keep highway RPMs reasonable?

Matt
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Unread 01-09-2013, 04:42 PM   #15
Matt1981CJ7
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A couple of things that are rarely discussed on these threads....why I retain these facts, I have no clue.

The physical dimension of the rear wheel wells, measured horizontally across the bottom of the tub, is almost exactly 32".

Any SUA suspension that allows the body to drop near the axle level in the rear, will rub if the tire is over 32". The OP's suspension is the same as mine, and it allows this type of "tuck", as my pics demonstrate.

Second point...the advertised tire diameter and the actual diameter are two different dimensions on many brands. My brand new BFG 32's measured less than 31" with 30 psi pressure in them, installed on the Jeep.

Matt
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