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 Post subject: 265-75-16 or 235-85-16 tires?
PostPosted: Mon Oct 23, 2017 9:16 pm 
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I know that most folks will recommend regearing to 4.10 with 32” diameter tires, but I’m more curious to know who is using tires of this size with stock 3.73 gears.

I want 32” tires but I don’t want to regear.
Or should I stick with 245-75-16 tires?
(I plan on doing a full OME lift in the near future)

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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Mon Oct 23, 2017 9:38 pm 
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flash7210 wrote:
I know that most folks will recommend regearing to 4.10 with 32” diameter tires, but I’m more curious to know who is using tires of this size with stock 3.73 gears.

I want 32” tires but I don’t want to regear.
Or should I stick with 245-75-16 tires?
(I plan on doing a full OME lift in the near future)
I've got 245/75R16 Cooper AT3s on Moab wheels with OME and 2 clevis spacers. I had rubbing in the front wheel wells. Had to trim the front of the wheel well and do surgery on the rear of the front wheel well by pounding the body joint. Not sure the 265's will fit without major trimming.

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 Post subject: 265-75-16 or 235-85-16 tires?
PostPosted: Tue Oct 24, 2017 1:18 am 
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I am running a 265/70r16 on Moab's currently and had to pound the pinch welds flat even with the OME+JBA top plate+1/4" clevis. I have an ARB so front clearance is not an issue.

From a power standpoint the 265/70's were pushing it until I put my own tune together at 400 ft-lbs and brought the torque down lower in the rpms. Now it pretty comfortably turns them. It was never the off the line acceleration but the low rpm cruising on hills that got my jeep. I would get in that loop where 5th gear was too much so it was jumping down to 3rd and then speeding up and then shifting back to 5th, rinse and repeat, since our trans logic sucks. If you are not climbing many hills then you could be just fine with a normal tune.

Obviously a 265/75 is gunna be that much harder to turn. I would be willing to bet that the narrower/lighter/lower rolling resistance of the 235 will make things much easier. I know On my F150 I increased from a 275/55R20 Bridgestone dueler(Aka sedan tire) to a 275/60R20 wrangler duratrac and saw no change in mpg and very little power loss. I specifically kept it the same width to avoid the mpg and performance hit and it seemed to work.


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Wed Oct 25, 2017 3:55 pm 
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I'm starting to think that the whole idea of having to switch to 4.10 gears with 32" tires is a bit overblown.
My friends JKU (Oscar Mike) is totally stock with 32" tires and 3.73 gears. She has no issues with that both on and off road.
I guess the biggest difference is that hers has a 4 speed 42RLE automatic.
The 545rfe in the CRD would only feel the difference at highway speeds (5th gear) and therefore going up a hill at 65mph might feel a bit strained.
I wish there was a way to lock out 5th gear without having to drop to 3rd.
But most of my driving is in the Florida flat lands so I wont have to deal with that often.

Through all my tire searches, on average, 235-85-16 are mostly 10 ply truck tires and therefore a bit heavier and more expensive.
The 265-75-16 tires are usually SL rated, less expensive (more popular), and not much heavier than my 245-75-16 tires.

So I think I've made my decision.
Now I need to buy some OME springs.

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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Thu Oct 26, 2017 4:07 pm 
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I have 32s with 3.73s and had 265/70/16s on another 3.7. You will lose massive amounts of power without regearing.

Do it right and regear. Im saving up for lockers and then will be regearing.

I would bet money if she tried to backup on a trail with her JKU it would be almost impossible.

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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Thu Oct 26, 2017 8:05 pm 
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Myke wrote:
I have 32s with 3.73s and had 265/70/16s on another 3.7. You will lose massive amounts of power without regearing.

Do it right and regear. Im saving up for lockers and then will be regearing.


This is excellent advice. Regearing will also take some stress off of the driveline that was introduced by the larger tyres.

Speaking as someone who ran an XJ with 31s on stock 3.55 gears for a couple of months, going to 4.10s was one of the happiest days of my life.

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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Thu Oct 26, 2017 10:03 pm 
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flash7210 wrote:
I'm starting to think that the whole idea of having to switch to 4.10 gears with 32" tires is a bit overblown.
My friends JKU (Oscar Mike) is totally stock with 32" tires and 3.73 gears. She has no issues with that both on and off road.
I guess the biggest difference is that hers has a 4 speed 42RLE automatic.
The 545rfe in the CRD would only feel the difference at highway speeds (5th gear) and therefore going up a hill at 65mph might feel a bit strained.
I wish there was a way to lock out 5th gear without having to drop to 3rd.
But most of my driving is in the Florida flat lands so I wont have to deal with that often.

Through all my tire searches, on average, 235-85-16 are mostly 10 ply truck tires and therefore a bit heavier and more expensive.
The 265-75-16 tires are usually SL rated, less expensive (more popular), and not much heavier than my 245-75-16 tires.

So I think I've made my decision.
Now I need to buy some OME springs.
You can't compare a JK to a KJ since they have different engines with different power bands,different trans,and different programming.

I don't care what anyone say's it is proven going to a bigger tire will always result in power loss unless you regear and even then you will still loose some mpg's but at least have the power back.

Oh and by the way most 265/75R16's are load range D LT tires,there are few P- metric versions of tires in that size and all are only highway or AT design.If you wnat 265/75R16's in a MT your stuck with a LT rating.


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Fri Oct 27, 2017 4:14 am 
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I run 265 65 17 or 31s stock gears and a GDE tune all good but would NOT go bigger!


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Fri Nov 03, 2017 9:33 pm 
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I had 235/85r16 Toyo M-55 on mine for about 50,000 miles. It had plenty of power with stock gearing.. It didn't make much difference in the performance, and I gained about 1 mpg over stock. I have no tune or performance mods other than egr delete. I occasionally pull a 6,000 lb trailer as well. The only reason I went back to stock size was because I'm planning to sell it and didn't want to spend $1,000 on another set of Toyos. Hope this helps.

PS. I should mention these where 10 ply tires that I kept at 60 psi, so that may have been some of the mpg increase.


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Fri Nov 03, 2017 9:57 pm 
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Flash, most of replies are from gassers except from mass hole . I run 32.1 inch tires on two Crds one with Daystar and one with OME with 2 clevis like mentioned above you will have to pound the pinch weld and trim some front plastic and you may have to modify the windshield fluid reservoir . But with any of the GDE tunes or equivalent you should not need to regear in my opinion. I rarely even take overdrive off. I do not however rock trail climb. Just mud and towing and some steep hills. If you don't want to trim quite a bit I would stay with about 31 inch tires. I also used spacers on wheels I think 1 Inch. I also gained mileage. Mine are 255 see sig.

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05 Blu Lim, Dayton, GDE HT, 255/75/18 , 210K , H TC
06 Bla Lim, GDE Eco, Destination AT 245/75/17, 151K, H TC
06 D Khaki Lim 126K wkII Eur TC
05 D khaki Lim 145k refurbishing
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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Fri Nov 03, 2017 10:13 pm 
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TKB4 wrote:
Flash, most of replies are from gassers except from mass hole . I run 32.1 inch tires on two Crds one with Daystar and one with OME with 2 clevis like mentioned above you will have to pound the pinch weld and trim some front plastic and you may have to modify the windshield fluid reservoir . But with any of the GDE tunes or equivalent you should not need to regear in my opinion. I rarely even take overdrive off. I do not however rock trail climb. Just mud and towing and some steep hills. If you don't want to trim quite a bit I would stay with about 31 inch tires. I also used spacers on wheels I think 1 Inch. I also gained mileage. Mine are 255 see sig.


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Sat Nov 04, 2017 7:32 am 
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TKB4 wrote:
Flash, most of replies are from gassers except from mass hole . I run 32.1 inch tires on two Crds one with Daystar and one with OME with 2 clevis like mentioned above you will have to pound the pinch weld and trim some front plastic and you may have to modify the windshield fluid reservoir . But with any of the GDE tunes or equivalent you should not need to regear in my opinion. I rarely even take overdrive off. I do not however rock trail climb. Just mud and towing and some steep hills. If you don't want to trim quite a bit I would stay with about 31 inch tires. I also used spacers on wheels I think 1 Inch. I also gained mileage. Mine are 255 see sig.


Thanks for the input.
I dont know what wheels you are using but I bought a used set of JK wheels to try out. They have 255-75-17 tires.
Of course they require wheel adapters/spacers to fit the JK 5-on-5 bolt pattern.
As it is right now, they wont fit without a 2.5 inch lift.

They came off a stock JKU with 3.21 gears.
So if a stock JKU v6 gasser can move these 32 inch tires, I dont see why a CRD with 3.73 gears cannot.

My pinch welds are already pounded down and a lot of the inner fender liner already trimmed away.
If I decide that I dont like the JK wheels I'll just sell em and probably get 235-85-16 tires for my stock wheels.

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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Sat Nov 04, 2017 12:01 pm 
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flash7210 wrote:
TKB4 wrote:
Flash, most of replies are from gassers except from mass hole . I run 32.1 inch tires on two Crds one with Daystar and one with OME with 2 clevis like mentioned above you will have to pound the pinch weld and trim some front plastic and you may have to modify the windshield fluid reservoir . But with any of the GDE tunes or equivalent you should not need to regear in my opinion. I rarely even take overdrive off. I do not however rock trail climb. Just mud and towing and some steep hills. If you don't want to trim quite a bit I would stay with about 31 inch tires. I also used spacers on wheels I think 1 Inch. I also gained mileage. Mine are 255 see sig.


Thanks for the input.
I dont know what wheels you are using but I bought a used set of JK wheels to try out. They have 255-75-17 tires.
Of course they require wheel adapters/spacers to fit the JK 5-on-5 bolt pattern.
As it is right now, they wont fit without a 2.5 inch lift.

They came off a stock JKU with 3.21 gears.
So if a stock JKU v6 gasser can move these 32 inch tires, I dont see why a CRD with 3.73 gears cannot.

My pinch welds are already pounded down and a lot of the inner fender liner already trimmed away.
If I decide that I dont like the JK wheels I'll just sell em and probably get 235-85-16 tires for my stock wheels.


It will turn them, especially in Florida since your biggest hill is what, 5 ft? I had trouble here only because I have 7% grades to climb everywhere and the transmission logic is bad and skips straight to 3rd gear on downshifts.

I think the width of the tire makes a big difference too. If you go 235 then there is prbably a good bit less rolling resistance than a 265.

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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Mon Nov 06, 2017 4:34 pm 
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I have one set on 17 inch rims the mud tire and one set on 18 inch rims the dueler they were both sets of five tires and wheels removed from gas jeeps when new for placement of larger tire/ wheel combinations. The more important thing is the overall diameter is 32.1 inches for each. I believe the 18 inch duelers were on a sahara model they have the circles pattern and the 17 inch look just like stock 16 inch crds and I have another set not used yet of the goodrich mud grip on a special edition jeep ( I believe) black and gray wheel but they were pretty pricey.

Mine will spin all four tires in mud.

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06 Bla Lim, GDE Eco, Destination AT 245/75/17, 151K, H TC
06 D Khaki Lim 126K wkII Eur TC
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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Tue Nov 07, 2017 11:29 am 
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TKB4 wrote:

Mine will spin all four tires in mud.

Anything can do that(with 4wd of course).


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Wed Nov 08, 2017 10:32 pm 
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it will also spin two on dry pavement pretty well . Either way you can't get any more traction with more power or different differential gears. then there is not using overdrive and then low range transfer if appropriate conditions.

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05 Blu LIM, OME GDE Tbo, wk II 245/75/17, KC Lights, bull bar, 195K H TC
05 Blu Lim, Dayton, GDE HT, 255/75/18 , 210K , H TC
06 Bla Lim, GDE Eco, Destination AT 245/75/17, 151K, H TC
06 D Khaki Lim 126K wkII Eur TC
05 D khaki Lim 145k refurbishing
All CRDS: Fumoto, Lift , Fan Shroud mod, fuel head Gen II, SAMCOS,self TB, 2 Mic filt, Hayden


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Wed Nov 08, 2017 11:27 pm 
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TKB4 wrote:
it will also spin two on dry pavement pretty well . Either way you can't get any more traction with more power or different differential gears. then there is not using overdrive and then low range transfer if appropriate conditions.

My KJ still can do that also with 35x12.50R15 MT/R K's and weighs 6400lbs and the stock 210hp 3.7 V6.

And yes you can increase traction by lowering the gear ratio.


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Thu Nov 23, 2017 1:57 pm 
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Finished the lift last night. Test drove it this morning.
JK wheels. 255-75-17 tires. No rubbing. No issues.


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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Thu Nov 23, 2017 11:04 pm 
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Looks great too!

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 Post subject: Re: 265-75-16 or 235-85-16 tires?
PostPosted: Fri Nov 24, 2017 1:28 am 
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I don't think our OME 2.5" lifts are enough for 32's at full stuff. When I bought my jeep it had 265/75/16's and they were WAY too big for the rear wheel well. I thought the common wisdom on this site always said 245/75/16 was the biggest for the OME lift?
I would carefully try to stuff one of those rear tires and see if it wants to eat the plastic wells.

As for gears, if you're only messing with mud then I haven't found the power reduction to be a problem, but out west I opted to put stock tires spaced out 2" and then I'm still unhappy with 5th gear on the grades, so I'm switching to P rated less aggressive tires to hopefully give me that little bit I need to hold 5th (bfgtk02's to cooper at3's). I'm installing new front wheel studs tomorrow to make the spacers a safe proposition. The stock wheels are so light that they are hard to beat with no other aluminum 7" options out there. sorry, TMI I'm sure :JEEPIN:

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