Max. tire size [Archive] - JKowners.com : Jeep Wrangler JK Forum

: Max. tire size


jgrogan
07-21-2008, 06:34 AM
Can anyone tell me what's the largest tire size you can fit on a stock JK without rubbing?

I don't need much width, just a little more clearance. Will a 31.5" tire fit without rubbing?

henthorn
07-21-2008, 08:07 AM
Im running a 285/75r16 on my stock JK. I am using aftermarket wheels though--crager soft 8's with 5 inch of backspace (55$ each) I dont have a lift and am having no rubbing issues (size is 33.1(ish) x 11.50 x 16)

Im using Mickey Thompson MTZ's

Bigjerm
07-21-2008, 08:22 AM
Rubicon's come stock with 32" tires, I know you can get (or could get) and upgraded 17" wheel and 32" A/T combo on the 07 X. So I would say a tire that measures 32" is safe, after that you will probably get a minor rub witha 33"

henthorn
07-21-2008, 06:25 PM
No rub with my 33's...... there are a couple on here as well that have the same combo... cragar 8's with 33's and no rub...

Dustoff '68
07-22-2008, 10:02 PM
285 x 70 x 17;)

beer:30
07-23-2008, 07:04 PM
i have 285's and a 2" BB on my X and have about 1/8" of clearance at full flex in the rear.
i must have the tall 285's

Dustoff '68
07-25-2008, 12:50 PM
BFG 285's are just a tad taller then the OEM 255's, and still shy of 33" by a miniscule fraction...no rub a dub dub here

henthorn
07-31-2008, 07:18 PM
BFG 285's are just a tad taller then the OEM 255's, and still shy of 33" by a miniscule fraction...no rub a dub dub here

Not to second guess....


But the BFG MTZ in 285/75r16 as measured on a 8 inch wide rime comes out to almost exacly 33.12 inches when at 28PSI. And just a bit over 11.5 inches across.

Just for what its worth

rockeye
08-12-2008, 07:44 PM
I have stock 255/75R17's and I was wondering how big of a tire size I can go with out putting a lift. Remind you though I am REALLY new at all this.
I noticed everyone talks about craiger rims but no one seems to be running on 17's.
Is there a reason for that? I would like to replace my stock rims with one from craiger and get the same size.
Any input, opinions what have you is greatly appreciated.
thanks.

SDMF
08-12-2008, 08:09 PM
I have stock 255/75R17's and I was wondering how big of a tire size I can go with out putting a lift. Remind you though I am REALLY new at all this.
I noticed everyone talks about craiger rims but no one seems to be running on 17's.
Is there a reason for that? I would like to replace my stock rims with one from craiger and get the same size.
Any input, opinions what have you is greatly appreciated.
thanks.

There are a few people running cragar 17's, you can't go wrong with steal wheels...nice and cheap and get the job done.

Dustoff '68
08-13-2008, 03:15 AM
Not to second guess....


But the BFG MTZ in 285/75r16 as measured on a 8 inch wide rime comes out to almost exacly 33.12 inches when at 28PSI. And just a bit over 11.5 inches across.

Just for what its worth

I'm running the 285/70/17 BFG KM2's, and they are just shy of 33"...they fit perfectly with no lift needed. ;)

henthorn
08-13-2008, 04:50 PM
well dustoff, what can I say.. I'm quoting almost direct specs from manufacturer as measured on an 8" wide rim. That directly corelates to what I have measured on my Jeep...

Then again.. maybe I must have gotten the plus sized 285/75r16 Mickey Thompson MTZ's....

lango
08-13-2008, 08:12 PM
Another question, Can you run 285/70/17 on the stock wheels with no lift?

Dustoff '68
08-14-2008, 05:42 AM
Another question, Can you run 285/70/17 on the stock wheels with no lift?

Sigh............that's what I've been saying....one more time..........I have BFG KM2's, size 285x70x17 mounted on stock 17" OEM/MOPAR/Rubicon/MOAB or whatever you would like to call the 17" factory/stock wheels, with NO LIFT and NO PROBLEMAS!:shaking:

lango
08-14-2008, 07:10 AM
Sigh............that's what I've been saying....one more time..........I have BFG KM2's, size 285x70x17 mounted on stock 17" OEM/MOPAR/Rubicon/MOAB or whatever you would like to call the 17" factory/stock wheels, with NO LIFT and NO PROBLEMAS!:shaking:


you never said anywhere "on stock rims" there are many aftermarket companies that are making 17" wheels. Just wanted to clarify, thanks for the input.

Do you mind posting a pic of your?

Thanks

84jeepjohn
08-14-2008, 08:31 AM
Something that EVERYONE needs to remember, is MOST tires run smaller than advertised. NOT ALWAYS but usually. AND the rim width will also play a part in the height. For instance I'm running BFG KM's on my CJ I have 15X10 rims on it. My tires are about 34" tall. My spare is on a 15X8" rim (one of my original set of the 35's long story) and it is taller than the others.

If you go to a tire store USUALLY if they have the tires, they can mount one for you and you can see if it fits. Honestly you sould be able to get a 285x70x17 on it no problem (hence dust off) and seriously if you really need it, slap a BB lift on it. most people will sooner or later want a lift.

lango
08-18-2008, 08:46 PM
FYI: I put a set of 285/70/17 BFg A/T's on yesterday, on stock wheels and the only place they rub is turning at full lock. The tires rub the front sway bar.

FOC
08-23-2008, 07:15 PM
3 questions.

by going with 285x70x17's, do you notice the jeep work harder at highway speeds?

does the speedometer still read correctly?

will they void the warranty?

henthorn
08-25-2008, 05:06 PM
3 questions.

by going with 285x70x17's, do you notice the jeep work harder at highway speeds?

does the speedometer still read correctly?

will they void the warranty?

No not really with the 285's... unless you have an auto then maybe a little bit harder.

No speedo does not read correctly... you need to get it reflashed for that.(any tire change will do that to the speedo)--its not off a lot just about 10%.

no, they wont void the warrenty..

YES... they help and make the jeep look like a jeep and not a car

FOC
08-25-2008, 05:17 PM
I asked about putting a larger size tire and he said that if something broke and they found that the larger size tire was the cause then it would not be a warranty issue. He said I had to use the same size but that I could change tread design.

I guess that means no super swampers and a lift kit.:hmph:

henthorn
08-25-2008, 06:59 PM
I asked about putting a larger size tire and he said that if something broke and they found that the larger size tire was the cause then it would not be a warranty issue. He said I had to use the same size but that I could change tread design.

I guess that means no super swampers and a lift kit.:hmph:

Time to find another dealer... hes feeding you a plate of BS.

33's arent big enough to cause anything to break...

militiakrawler
08-25-2008, 08:23 PM
Time to find another dealer... hes feeding you a plate of BS.

33's arent big enough to cause anything to break...

x2
There are dealers out there that are putting lifts and large tires on for customers when they buy their new Jeep. And they waranty it just like stock.

southwindphoto
10-29-2008, 05:27 AM
In running larger tires do you find a drop in fuel economy?

Does your JK still ride and behave nicely at interstate speeds?

To me the new JK are the first Jeep to ever ride at 70+ MPH in comfort, and I am very leery at messing that up.

Off road performance:
For me Iím off road about 5% of the time, and the rest of the time, my JK is used around town or on the highway, and giving up 2-3 MPG for a minor improvement in off road performance is not worth it to me.


Whatís you uptake on larger tires:

TEEJ
10-29-2008, 05:55 AM
In running larger tires do you find a drop in fuel economy?

Some people get an INCREASE in true mpg with slightly larger tires, as the larger tire essentially provides more of an overdrive ratio.

The stock 3.21 ratio provides the best mpg....the 3.73 and 4.10 ratios drop mpg by raising your rpm...so a larger diameter tire can drop the rpm, and improve mpg.

If the larger tire has higher rolling resistance, then that resistance can reduce mpg....so it is very tire specific.

Does your JK still ride and behave nicely at interstate speeds? Again, very tire specific...some ride better than others, and/or handle/brake better, etc.

To me the new JK are the first Jeep to ever ride at 70+ MPH in comfort, and I am very leery at messing that up.

Off road performance:
For me I’m off road about 5% of the time, and the rest of the time, my JK is used around town or on the highway, and giving up 2-3 MPG for a minor improvement in off road performance is not worth it to me.


What’s you uptake on larger tires:

My take on larger tires is that they improve performance...the larger contact patch gives more grip on road and off, and flotation on soft ground, and the taller diameter also decreases the steepness of the terrain ramp that forms in front of a tire, making it easier for it to roll over, etc.

JEC
12-03-2008, 08:07 AM
2008, no lift, with BF Goodrich 315/70R17 All Terrains, 1.5 inch wheel spacers.
I had to trim the the plastic air dam up front, but that was a simple matter. It rides nice and road noise from the tires is minimal.
According to my GPS, the speedometer reads about 2-3 mph less than actual at highway speeds.
http://centerphotography.com/images/space/whitejeepafter800.jpg

jocrazy0
12-03-2008, 07:38 PM
JEC: Thanks for the post and the pict. I have been debating those tires and the KM2s in that size (315/70-17) albeit with different rims. Almost everyone has been saying I'd need 3-4" of lift to run 35's (34s by calculation) and the cost of 5 TIRES and RIMS and LIFT all at once is a bit.... more than I can handle at the moment. Next fiscal year it appears. Thanks again.

Gordon2
12-03-2008, 08:29 PM
2008, no lift, with BF Goodrich 315/70R17 All Terrains, 1.5 inch wheel spacers.
I had to trim the the plastic air dam up front, but that was a simple matter. It rides nice and road noise from the tires is minimal.
According to my GPS, the speedometer reads about 2-3 mph less than actual at highway speeds.
http://centerphotography.com/images/space/whitejeepafter800.jpg

Looks nice. I have the same White Unlim X. No upgrades yet. Like the tires and side steps. What are the steps.

MUD707
12-04-2008, 10:15 AM
The 315/70R17 what size would that tire diameter be in inches about, and how to they handle offroad? Any rub when flexed out?

jocrazy0
12-04-2008, 01:38 PM
Sticking my nose in when not asked.....

315/70x17 (calculated) is:

315/25.4 = 12.40"w x .7 = 8.68 sidewall height * 2 = 17.36 + 17 = 34.36" high.

The manufacturer says 34.8". So in marketing speak its is the metric equivalent of the 35x12.50/17

Ahhh marketing and rounding, what would we do without them?

hig4s
12-04-2008, 03:17 PM
Any rub when flexed out?

You can bet on it!!!

JEC
12-04-2008, 03:54 PM
You can bet on it!!!
hig4s:
No doubt you are correct. This particular Jeep won't see much flexing for a while. It'll be a daily driver and I was seeking comfort, appearance, room and getting through the mud/snow with no worries when I bought it. The "35s" show no issues with rubbing for the daily traveling about town, and driving over the occasional curb or parking block. For the fun/more aggressive stuff, I have my 97 TJ and Suzuki Vinson 4-wheeler.

Jocrazy:
Yes, at most of the tire dealers, mentioning even 33 inch tires results in being told I need at least a 3-inch lift. At some point, I will probably add a 2 inch to this one. For now, it'll stay as is for primarily road use.
I really do like these tires. They are quiet on the highway, aggressive enough for this Ohio winter season, and will get me where I want to go. I have a set of Ion polished aluminum #171 17x9 wheels on order, which should be here a couple of weeks.

Gordon2:
Thanks. The side steps came with the package from the dealer. According to the sticker, they were a $395 option.

-John

crestoncowboy
12-24-2009, 11:44 AM
i know this is an old thread but i was searching to see if i could run 285 70 `17 on stock rubi rims. some said on this site it worked with no rubbing. i had already ordered a 2 inch lift anyway. i had ross dodge in boone order km2s and install them and they did hit the sway bar hard at full lock. it would work but not well. i have an 08 rubicon 2dr. my guess is the steering stop is set different on every jeep by a fraction and some rub bad and some dont rub.

bareass
12-27-2009, 11:03 AM
i put 305/70 16s on my rig before my lift. i have 5" backspacing with no rubbing on road, but i wouldn't want to wheel it, or at least not disconnect the swaybar

TXROCK
12-27-2009, 03:06 PM
i put 305/70 16s on my rig before my lift. i have 5" backspacing with no rubbing on road, but i wouldn't want to wheel it, or at least not disconnect the swaybar


yeah..in a stock JK, my Rubicon was fine with 32s and could flex with no issues. Once I upgraded, on road it was fine...but when flexing you get rub on the backside with the stock backspacing. If you have the Rubi wheels it has 6" backspacing and need 4.5" to prevent rubbing with bigger/wider tires.

jeimep
12-27-2009, 05:50 PM
ross dodge in boone

I bought my Jeep at Ross Dodge. Anyways, I have 285/75/17 BFG All Terrains on stock rims with no spacers or lift. No rubbing.

JIMBOX
12-27-2009, 06:32 PM
:shaking: I can't comment on 285's, but whatever the MFG says the tire dia. is---it's different ON YOUR WHEELS AND JEEP

My BFG LT255/75x17 Mudterrains A/t, were listed at 32"--Nope on my jeep Rubi, with 8" wide 17" wheels, they are 31"

My 295/75x16's on 8" wide 16" wheels are 33 1/4" ON MY JEEP

:grinpimp::grinpimp: JIMBO

DanNEBTD
12-29-2009, 05:51 AM
When you guys refer to rubbing while offroad do you mean disco'd or no? I plan on running 35's on my 2dr softtop with the 4dr hardtop + tow pkg springs . . . Possibly a BB but I'd rather wait and jump into a real lift. Will 35s rub a lot
with the two inches or so ill gain from those springs if I dont disco?

crestoncowboy
12-29-2009, 07:28 AM
mine hit pretty bad at full lock without disco. flexing didnt make it better or worse the tires hit the sway bar not the fenders or the body.

wxsby
01-19-2010, 11:22 AM
New to this forum and thanks for the great info. Getting ready for my first tire upgrade on my 08 and you have done all the research for me. This calculator comes in handy but I can't vouch for it's accuracy:

http://www.discounttiredirect.com/direct/brochure/info/tmpInfoTireMath.jsp

BubbaBirch
02-12-2010, 03:02 PM
Hello,

I am new here and was told to check you guys out for some good info. Sorry as I am sure this question has been asked a million times but I am looking to order new tires for my '08 Rubicon....it is stock and I am looking at tires that are 285/70/17, the height of the tire is 33in and the width of the tire is 11.5in per Quadratec. Will that be too big for my stock Rubicon?? I know the current size is 255/70/17 and wanted a little bigger tire. I am looking at the Goodyear MT/R w/ Kevlar if that matters. Would I have issues with rubbing?? I dont do a whole lot of offroading...just the beach down OBX and some dirt roads...no rocks or anything like that.

Thanks for your help, and again, sorry for asking the same old question.

Bob

redneckjk
02-16-2010, 04:23 PM
i have toyo 285/75r/16 mts on mine and ran them for a couple of months without a lift and had no rubbing issues. mileage fell off about 3.5 mpg but the toyos are a fairly aggressive tire and the lift did not help any either. my wheels have 12 mm of offset and 4.5" of backspacing and are 8" wide. i bought the after market wheels because of tire prices. the 16" tires were 90 dollars per tire cheaper than the 17". so to answer your question you can run the 32 or 33 inch tires without a lift, but you may have some rubbing issues at full turn with stock wheels and 33s. my x came stock with the 17" moab wheels and the 32" goodyear SRAs.

KAVIK
02-16-2010, 04:26 PM
okay i have to jump in now lol... My 2010 Sahara 4 door arrives soon and what is the max size tire I can put on the stock 18" wheels without a lift (no rubbing etc...) I was planning on a lift and 35's until I was a victim of cutbacks at work last week:(

ed_nigma
02-18-2010, 09:43 AM
I run 33" STTs on 18" rims on an otherwise stock Sahara, no worries here, I believe they're slightly wider than 11".

KAVIK
02-21-2010, 12:26 PM
I run 33" STTs on 18" rims on an otherwise stock Sahara, no worries here, I believe they're slightly wider than 11".

Are those on the stock 18" rims and do you have spacers?

ed_nigma
02-21-2010, 01:19 PM
Are those on the stock 18" rims and do you have spacers?

Stock rims, no spacers, no rubs, this was the largest tire that can fit in stock form from what the dealer told me, $1300 even mounted and balanced.

http://www.jkowners.com/forum/showthread.php?p=351000#post351000

KAVIK
02-21-2010, 01:37 PM
Stock rims, no spacers, no rubs, this was the largest tire that can fit in stock form from what the dealer told me, $1300 even mounted and balanced.

http://www.jkowners.com/forum/showthread.php?p=351000#post351000

Awesome thanks, I have an Unlimited Sahara but I am sure that won't make a difference in this case. Is there a large difference in the speedo reading or any issues with the electronic stability control?

ed_nigma
02-21-2010, 10:32 PM
Awesome thanks, I have an Unlimited Sahara but I am sure that won't make a difference in this case. Is there a large difference in the speedo reading or any issues with the electronic stability control?

The speedo runs maybe a mile slow, haven't noticed any issues with the ESP on dry or wet pavement, on ice and hard packed snow the Duelers are better.

The handling definitely is not as confident as the Duelers, but not enough to make driving at 55 unenjoyable.

The big difference is gas mileage, they easily reduce mileage by 25%, suck a lot of power too.

I hadn't planned on running two sets of tires, but the drawbacks on pavement were enough to convince me it was better to keep the Duelers for my DD and leave the STTs for weekend fun.

I'll be running the STTs when we go to SD though, but I'll trailer them since we're hauling other stuff too.

lohchief
02-22-2010, 01:25 PM
I have no intentions of lifting my jk,and my off road stuff is mild compared to some.Having said that I am going to run 275/70R17 Cooper s/t's.They are at's and will do the job I need them to do with zero rubbing issues.They are only about a 1/2" taller and wider then my stock 32"SR/A's.That will suit me just fine.:smokin:

Fritobandito111
02-22-2010, 07:45 PM
I have LT305 65/17 and have no rub. They arent that big of a tire but I cant find any snow chains for these ProComps to save my life. Not to change the subject but do you have any place that has chains for that size tire or do I have to get some custom made? Thanks folks!

KAVIK
03-03-2010, 12:52 PM
okay so have been doing some hunting for replacement rubber for my Jk.
Sitrep: 2010 JK Unlimited Sahara
18" stock rims. current stock tires are P255/70R18 OWL On-/Off-Road Tires
I don't rock crawl or such (at this point)
I do trails, logging roads, and overland; for off road use. Also need good on road manners as I use it as my daily drive.
I live in Canada so that means snow nearly 1/2 the damn year.
So I have been helped by ed_nigma here and others with some ideas Thanks guys;)
But I am thinking that this is the tire for my needs so I am looking for your wisdom and such:smokin: here are the tires i am considering:
First need to know if they will rub? If so ...wheel spacers 1.5" enough?
and any general comments on the tires if you have used them and what you think. I am not planning on a lift in the near future.

Good Year Wrangler Dura Trac
LT275/70R18 125Q BSL 7.0 - 8.5 8.00 11.0 33.2 3,640 @ 80

thanks in advance!:D

Little Red Zuk
03-03-2010, 02:23 PM
Here's the 285/75/16 going on my rig today. I might have some rubbing off road though, but right now clears fine.

http://photos-e.ak.fbcdn.net/hphotos-ak-ash1/hs470.ash1/25770_1380429348341_1160136453_31136588_8299737_n. jpg

jkristie44
03-05-2010, 12:02 PM
Here is mine 287-75-16. No rubbing at all.

:beer:

scott_stahley
03-10-2010, 12:10 PM
I have stock Rubicon Dana 44 axles. My question is the following, will my axles support 37" tires? Or should I stick with 35's?

rotcyboi
03-10-2010, 06:17 PM
anything bigger than 32 and youll bend the axels :thefinger: haha

Born2run
05-01-2011, 01:33 PM
I have the 285 70 17 GY MTR w/kevlar. I'm using springs from a JKU Rubi that gives me a about an inch lift over stock. I get tire rub at full lock on the upper control arm. So adding spacers to compensate. Other then that tires work well.

JOHN412
05-03-2011, 01:07 PM
285/70/17 TOYO AT measure 32.7 on the website and seem to be about that installed from my rough measuring. There about 1.5" wider than the stock tires were and do not rub at full lock turn. I also do notice a loss in power. Its not huge but where I used to be able to pull hillls in 6th need 5th alot more often. ALSO I lost 2mpg with these tires. Imagine 35 or 37 for anyone wondering.

JeepingGreen
05-04-2011, 11:53 AM
Boy... No love for 15's in this thread!? I just wanted to mention one thing - in terms of "cost", you will find that 15" tires (well, tires for 15" wheels) are (typically) MUCH less than 16's or 17's.. Although I am running 35's, I must say - if I went down to 33's I would, without a doubt, run 15" wheels.. That's just me, though - and yes, everyone's opinion will vary..

There are a few considerations though:

1, Not all 15" wheels will clear the brake calipers - there are threads that can tell you which ones will/won't. If they won't, some (minor) grinding to the caliper would be needed.

2, With 15" wheels, you might not be able to upgrade your tie rod ends (if you were thinking of beefing them up). I have found that Moog makes a TRE that WILL fit 15's.

3, With 15" wheels, the oversized brake upgrade kit will not fit. I believe you need 17's (at least) for this. Period.

Didn't mean to de-rail the thread - just saw several people mention concerns with cost.. With that said, I fuggin LOVE mah 15's!!!!

http://www.jeepcali.com/albums/the-rubicon-trail-november-2010/rubicontrailnov2010391.jpg

mrwhocares
05-10-2013, 02:41 PM
The max tire size with stock 17s is 285/75/17s (33.8x10.4) in order for this to not void the warranty it has to be installed by a Mopar qualified dealer and have your computer re calibrated. (I also had to upgrade to dana 50s according to Mopar) Also wheel spacers are a huge NO to warranties they will immediately void the warranty on most of the power train. Im not posting this to be judged but for those like me who have purchased the Mopar Unlimited bumper to bumper warranty there are do's and don't and it must be done by Mopar. I have an winch bumper that came off a MOAB but it has to have a Mopar part number in order to be added to warranty...you can take that to the bank...Mopar sales those warranties banking you'll make changes so they don't have to stand behind it!:shitstorm:

So if you need a lift, springs can be use from a JKU on a JK and thats acceptable and gives you almost 2 inches; without this you have no sway articulation and might as well throw away your disconnect. But you have to be very careful to not void your warranty, mopar parts and factory installation is the only way. Center-cut rims can also help where wheel spacers would, I dont recommend it because you open yourself up to brake and steering component failure that Jeep doesn't have to cover! I'm a newB to this forum, not jeeps or other jeep forums.

This is just advice, why ruin a warranty on the most capable production vehicle off the assembly line, people can say their modifications won't void the warranty but unless they've done so and have it in writing I recommend you take the safe route because I have unlimited years/mileage bumper to bumper on my Rubicon and that is buying generations of fun!

matt_the_water_rat
05-20-2013, 07:07 PM
The max tire size with stock 17s is 285/75/17s (33.8x10.4) in order for this to not void the warranty it has to be installed by a Mopar qualified dealer and have your computer re calibrated. (I also had to upgrade to dana 50s according to Mopar)

So Mopar wants you to run Dana 50s... the out of production - Ford truck exclusive - front axles ... for warranty support of a 285/75/17 tires?

Shirley you can't be serious :bounce: