Anyone know how much trimming/what to trim for 32X11.50s?

cbhafler · **Joined:** Wed Jul 18, 2007 6:49 pm **Posts:** 2

Im putting 32s (32X11.50R15 Pro Comp Mud Terrain) on my KJ with a 3" lift. Anyone know how much trimming and any other mods i would need to stop it from rubbing? any suggestions would help! thanks.

_________________________
2004 Black Sport
3" Rough Country Lift
15X8 Rock Crawlers (4.5" B.S.)

RespectMyLibertay · **Posted:** Wed Jul 18, 2007 9:35 pm

Yikes! OK, I'll be the first to tell you...you'll probably never fully stop the rubbing with those tires and our currently available lifts for the KJ. Assuming you already have a 2.5" lift...expect rubbing on the pinch weld (pound it: look in Tech section), fender-well linings (rip them out), fender flares (trim with something that cuts cleanly), swaybar, and even the body (specifically, frame edge in front of and behind front upper control arms) and the front control arms themselves! I stopped my swaybar rubbage by getting wheel spacers. I could have also gotten new wheels with less backspace. You could do either, but I think with tires THAT wide, you'll increase rubbing on the flares by pushing them out and away from your swaybar and control arms. You can install bumpstops in the rear, but really that just decreases your articulation and just allows you to run those bigger tires without ripping off the door flares while going over any bump.
Wait...it just came to me!...rip all your flares and bumpers off (after you take out the fender-well linings), get rims with probably 4.0-3.0" backspace, and you STILL might rub on the fender panels and rear door areas. Do it! And make sure you post pictures.

Jeepjeepster · **Posted:** Wed Jul 18, 2007 9:54 pm

They would rub bad everywhere. The rear flares would be torn off at full flex without some buy extened bump stops.

It would be kinda slow too without a re-gear.

ProjektKJ · **Posted:** Wed Jul 18, 2007 10:41 pm

save your self a hell of a lot of time, and your jeeps looks, and just get a 31 x 10.5 tire

snow blower · **Joined:** Thu Feb 16, 2006 4:24 am **Posts:** 69

i think the biggest question is what the true OD of the tire is, and the size of the side lugs. for example i think 32" MTR's have a true OD of 31.7" or something; and the trxus tires have big side lugs so width is very limited. I'm gonna try and run a set of MTR's the same size as the mud terrains you have, but they're down to around 75% tread (off another jeep project). So we'll see how it goes

Worse comes to worse, i just drop down to a 31x10.5

RespectMyLibertay · **Posted:** Thu Jul 19, 2007 2:42 am

As far as I can tell, what can tell you a tire is gonna rub is the sidewall width and tread width. The problem you'll see is rubbing the on the frame in front of and behind the front upper control arms. I had it happen with stock rims and 245/75R16 mudders. They rubbed there and on the swaybar while just turning on the street. To correct this problem I'm sure you'll have with wider tires like that, you'll want to get different rims, probably 3.5" or less BS since those with 30x9.5" tires (read: 245/75R16s, the most common tire size around here for 2.5" lifted KJs) go with 4.0-5.0" BS rims to help rubbing. But, even with the 245/75s, once you get the BS less than 4.0" your tires start hitting the flares a lot more often. A guy posted on here awhile ago with 31x10.5" BFG A/T KOs on 15" rims with 3.75" BS. He said the rear tires rubbed all over when going over almost anything. If you already have the fender well linings out, you'd have to rub the out edges of the flares with tires as wide as 11" on a rim with 3.5" BS. Any less BS on the rims, and you'll definitely rub the body of the KJ front and rear. Either with the ideal BS, with tires that wide, if could rub the body while still popping your flares off. Some people have fit 265/75R16s and still get good articulation, but they use bumpstops and some keep their rear flares off, permanently. Those tires are at least an inch less in width than the 32x11.5s.

moose · **Posted:** Thu Jul 19, 2007 1:26 pm

if you feel you need 32's, look at 235/85's. since they are 9-9.5" width, you will avaoid some of the issues mentioned above. if you need the width, you should look at a shorter tire....

Neatus · **Posted:** Thu Jul 19, 2007 8:36 pm

I have 265/75/16 ProComp MTs and everytime I flex I pop rivets out of my rear flares. I replace them every time I wheel. It is annoying. Up front I rub the sway bar minimally when turning and had to trip three spots on the fender liners. My tires come to right about 32" but arent nearly as wide as you are wanting to go.

spoonplugger1 · **Posted:** Thu Jul 19, 2007 9:01 pm

Listen to the people like Moose and RespectMyliberty, at best those tires will be marginal poser tires, worth zip off road.
Wide tires are for the street only and Jeeps don't do well if your looking for the best performance off road under the most conditions. Wide tires only do well in 3 conditions. Deep mud, deeper than your ground clearance, sand and deep snow.
I'm not sure the steering system would last long either with those size tires, and replacements aren't cheap. Also if you break a steering system off road you are jacked, just about anything else you can at least be towed out. Then there is that aluminum front diff.
Do your homework here, just about everything has been tried, and lots have paid the price for failures related to tires and wheels.
Remember the old racing adage "To Win You First Have To Finish."

snow blower · **Joined:** Thu Feb 16, 2006 4:24 am **Posts:** 69

this is a great thread... i've been checkin everywhere for this kind of info. As far as flare contact, my buddy owns a race car / hot rod / chassis shop and he's gonna do some work on the flares/fenders. Would 3.75" BS be the best option though, as far as inner spacing goes??

tommudd · **Posted:** Fri Jul 20, 2007 9:35 am

3.75 is going to be sticking those tires way out there with even more contact with the flares etc. If your buddy is building new flares then thats another matter in a way but ........

tjkj2002 · **Posted:** Fri Jul 20, 2007 9:46 am

snow blower wrote:

this is a great thread... i've been checkin everywhere for this kind of info. As far as flare contact, my buddy owns a race car / hot rod / chassis shop and he's gonna do some work on the flares/fenders. Would 3.75" BS be the best option though, as far as inner spacing goes??

I ran 16x8 rims with 3.75" BS,as long as you never flex the suspension you'll be fine,I ripped my rear flares right off at the slightest flex,plus there is major trimming that needs to be done in the front,a ARB bumber will help.Otherwise you'll need to cut away a major portion of the front bumber.But I was running 265/75 MT/R's to.

tommudd · **Posted:** Fri Jul 20, 2007 12:36 pm

tjkj2002 thats what I thought you had, but if they ran a 15X8 with that back spacing and 32X11.50 there would be a lot of "wear and tear" on the flares I would assume! It all comes down to tire/section width, most seem to forget that

tjkj2002 · **Posted:** Fri Jul 20, 2007 1:53 pm

tommudd wrote:

tjkj2002 thats what I thought you had, but if they ran a 15X8 with that back spacing and 32X11.50 there would be a lot of "wear and tear" on the flares I would assume! It all comes down to tire/section width, most seem to forget that

I was running those 16x8 rims with 3.75 BS,I got rid of those quick after doing some trails here in CO,went with 16x7 rims with 4.5" BS and eleminated all my rub issues.11.50's are just way to wide for the KJ,as long as you never leave the pavement then you'll be fine but going offroad they are just to wide and will cause some damage to the KJ and the tires themselfs.Stick with 265's or less(9.5") and you'll be good. As far as running 15x8 rims with 3.75" BS will do the same thing as 16x8 rims with 3.75" BS with the same size tires.

cbhafler · **Joined:** Wed Jul 18, 2007 6:49 pm **Posts:** 2

Thanks all for the advice. I went for 31X10.50s. I want it to be functional offroad more than anything.

___________________
2004 Sport Black
3" Rough Country
31X10.50 Pro Comp MTs
15X8 Rockcrawlers
4.10 gears

RespectMyLibertay · **Posted:** Sun Jul 22, 2007 3:45 am

cbhafler wrote:

Thanks all for the advice. I went for 31X10.50s. I want it to be functional offroad more than anything.

Let's see some pics! :twisted:

Anyone know how much trimming/what to trim for 32X11.50s?

Who is online