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Old 08-17-2014, 10:03 PM   #1
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Will big tires always fit?

Have a stock 03' tj and the tires are a little... Girly I guess thinking about at least 30's. Question is without any lift will a certain size be too large for the frame?

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Old 08-17-2014, 10:28 PM   #2
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I just slapped on 31x10.5 15's on my 2006 TJ and they fit great. No lift. No rubbing when maxing out a turn. They hang out beyond the stock fender flares about 2" (4.5" backspace on 8x15 wheels). I am pretty happy with the new set up. I will put the stock skinnies on when the snow starts to fly.

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Old 08-17-2014, 10:35 PM   #3
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31s are the max a stock tj can fit without any modifications
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Old 08-18-2014, 07:30 AM   #4
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Big tires are bad in the snow??
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Old 08-18-2014, 07:40 AM   #5
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Big tires are bad in the snow??
Absolutely not. The more tread to surface contact, the better chance of finding grip. The most important thing is to have the right kind of tire for the conditions.
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Old 08-18-2014, 08:42 AM   #6
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Absolutely not. The more tread to surface contact, the better chance of finding grip. The most important thing is to have the right kind of tire for the conditions.
usually narrower tires have an easier time cutting through slush or fresh snow and getting to solid ground.

that said, a quality set of tires is always a good idea and i dont have any issues with 12.5" wide tires and Chicago winters
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Old 08-18-2014, 10:05 AM   #7
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As a joke we just put 32" tires on my friends TJ. They rub at full lock and over BIG bumps but he's still using them and having fun though.
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Old 08-18-2014, 11:41 AM   #8
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2005 Sport TJ want 35s how much more lift need ? This Jeep Forum Rocks!
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Old 08-18-2014, 11:46 AM   #9
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2005 Sport TJ want 35s how much more lift need ? This Jeep Forum Rocks!
Upgraded steering, upgraded brakes, re-gear the diffs, and add about 4" of total lift over factory. That can be completed many ways. 35s take a lot of research and planning to do it without spending a lot of cash and having a poor feeling jeep
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Old 08-18-2014, 01:27 PM   #10
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Originally Posted by rakasha681 View Post
31s are the max a stock tj can fit without any modifications
being that 31's are the biggest for stock diameter how about width?
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Old 08-18-2014, 02:08 PM   #11
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Originally Posted by Workin on my TJ View Post
being that 31's are the biggest for stock diameter how about width?
on stock rims?

9.5"-10.5"

some rims have more backspacing and require a washer behind the steering stop when using 10.5" wide tires. no big deal
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Old 08-18-2014, 04:31 PM   #12
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The 31 cut off has nothing to do with stock rim diameter it has to do with stock suspension and stock fenders and rub

Lifted stock rubi rims can easily go to 33 x 12 or the metric similar size

The stock rim width limits tire width and stock rim back spacing is an issue but not the diameter

With proper lift you could probably run bfg TA ko 33s in either 10.5 or 9.5 width but would not consider 33x12.5 on less than 8 inch wide rim
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Old 08-18-2014, 04:37 PM   #13
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The 31 cut off has nothing to do with stock rim diameter it has to do with stock suspension and stock fenders and rub

Lifted stock rubi rims can easily go to 33 x 12 or the metric similar size

The stock rim width limits tire width and stock rim back spacing is an issue but not the diameter

With proper lift you could probably run bfg TA ko 33s in either 10.5 or 9.5 width but would not consider 33x12.5 on less than 8 inch wide rim
ummm, what? i think i disagree with everything you've stated.

and where did rim diameter come into question?
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Old 08-18-2014, 04:43 PM   #14
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ummm, what? i think i disagree with everything you've stated. and where did rim diameter come into question?
I'm talking completely stock jeep with the tire width
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Old 08-18-2014, 04:51 PM   #15
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Quote:
Originally Posted by Workin on my TJ View Post
I'm talking completely stock jeep with the tire width
31x10.50R15 is the largest tire you can fit stock.
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Old 08-18-2014, 04:52 PM   #16
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there have been several rims used on jeeps, so depending, you can either run a 31"x9.5" or a 31"x10.5" with no rubbing. some rims have more backspacing so you may need to add a washer behind each steering stop when going with a 31x10.5", but this is not with all oem jeep rims. it is a minor modification that takes 5 min to complete and there is no noticeable difference

i would say the largest you can run is 31x10.5"
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Old 08-18-2014, 05:28 PM   #17
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Originally Posted by Workin on my TJ View Post
being that 31's are the biggest for stock diameter how about width?
I read that as he thinks that 31 is the biggest tire you can fit on a stock diameter wheel as he said biggest for STOCK diameter

Like I said you can fit a much bigger diameter tire on stock diameter wheel with adequate lift but stock wheel width limits how wide a tire you can fit.

However with washers on the steering stops and 3 or 4 inches of combined lift you can run metric equalivent of 33x12 on stock 16" rubicon rims with no rub

I just want him to understand that stock wheel diameter is not a limiting factor for bigger tires.
lift, fender clearance, backspacing, and rim width can all be limiting factors but you can run big ass tires on 15" diameter wheels even if you disagree
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Old 08-18-2014, 05:42 PM   #18
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gotcha, i think the op was already confused enough and realized that 31 was the largest diameter he could go with no lift.

i question the ability to go to 33x10.5 on stock rims no matter lift height as a larger tire will put that much more rubber into the CA, frame, or sway bar. it would require a ton of steering stops to do a 33x12 on a stock rim, no matter the lift height. in order to not rub, you would have to be in a basically straight line and then you'd run into issues with the coil buckets on the back.

of course you can run bigger tires on a 15" wheel, how did that even come up? sometimes you have to read between the lines a bit
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Old 08-18-2014, 06:27 PM   #19
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Quote:
Originally Posted by Workin on my TJ View Post
Have a stock 03' tj and the tires are a little... Girly I guess thinking about at least 30's. Question is without any lift will a certain size be too large for the frame?
Yes
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Old 08-18-2014, 06:56 PM   #20
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Wrong pics STOCK rubicon rims 2 washers plus lift NO RUB metric basically 33 by 12

Turns fine
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Old 08-18-2014, 07:00 PM   #21
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33 x 11, and i doubt it is as smooth as you claim. but it really doesnt matter, the OP has his answer

31x10.5"
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Old 08-18-2014, 09:41 PM   #22
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I had 32s on my stock tj years ago. Rubbed at full lock. Drove fine besides that.


But yea, 31 is the typical "go to" for a stock tj.
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Old 08-18-2014, 10:01 PM   #23
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Can you notice any difference between a 30 and a 31?
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Old 08-19-2014, 08:51 AM   #24
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about half an inch
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Old 08-20-2014, 10:29 PM   #25
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about half an inch
Is that suppose to be funny? Haha that's funny, something my dad would say.
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Old 08-20-2014, 10:44 PM   #26
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I have 30 by 9.5s on mine. I still get 18-19 miles per gallon and it handles well on the highway at 70 miles per hour for a Jeep. I would have no desire to go to a 31 tire. If I can't clear it, then that is what my driving skill and skid plates are for:>)

And my understanding is that 30 by 9.5 is the largest one should go with a stock Jeep. But I'm in the minority here I see. So double check.
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Old 08-21-2014, 12:15 AM   #27
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There's a lot of ways to get the size tire you want, with or without a lift. You could chop the wheel wells, put in flat fenders, go with different rims, it all costs. Figure out what you want the jeep to be and build it from there.
Reading on here helps a lot, do a lot of research, and spend the money on quality parts
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Old 08-21-2014, 12:35 AM   #28
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I ran 31x10.5R15 on Jeep Ecco alloy rims for ten years with no rubbing or clearance issues whatsoever. Full cycle of the suspension and you will have plenty of room all around. 32s fit really well but will rub a bit at full lock, so the washer on the stop trick solves that.

Without a 2" budget boost 32s look sort of stuffed, however.

The TJ just looks "right" with 31x10.5 tires under it. I ran a set of 30s for a while. It was a namby-pamby thing to do. I fretted over moving up to such "big" tires as 31s. What a waste of time and money. I should have ditched the stock Goodyear GSA 27" street tires and gone straight to the 31s.

The TJ comes with the speedo gear for a 31 already installed. I did not have to change mine. I bought one and when I pulled the still pretty new stock one it was the same color and tooth count. They fully expected us to slap on 31s and stuck the correct gear in the transfer case in anticipation of that. I have never seen or even heard of a speedo gear for the stock 27" itty-bitty things that came on our TJs. The upgrade to the 30" tire package still netted you a speedo gear for a 31" tire. At least this has been my personal experience in making this swap for my two TJs and about ten of my friends. All came with the light blue 31" speedo gear, whether the TJ came with the silly 27" tires or the 30" upgrades.

Run with 31s, OP. You will have no problems. You will gain a half inch of clearance over 30s and have larger contact patches that are still small enough to do well in the snow.

Try some nice BF Goodrich All Terrains. They are great on the road and do very well in most off road situations save for deep, sticky mud, where they sort of suck. The also do not so well in loose, dry sand. Otherwise you will get a lot of miles from them. A lot. They wear like iron and are reasonably priced. They are not cheap but you can afford them.

The two photos show my old 2003 SE 2.4L with BFG AT tires in 31x10.5R15. They fit just fine on all planes.

The second shot is of my two TJs. The left one is the one in the snow photo. The right one is another 2003, but a 4.0L Sport. It has 33x12.5R15 tires. They are the exact same BFGs but with the white letters turned in. I think I like the white better and will turn them back out at some point.

Whatever you decide to do: good luck! And post pics for us to ogle when you get it done, man...

Cheers!
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Old 08-21-2014, 12:55 AM   #29
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I ran 31x10.5R15 on Jeep Ecco alloy rims for ten years with no rubbing or clearance issues whatsoever. Full cycle of the suspension and you will have plenty of room all around. 32s fit really well but will rub a bit at full lock, so the washer on the stop trick solves that.

Without a 2" budget boost 32s look sort of stuffed, however.

The TJ just looks "right" with 31x10.5 tires under it. I ran a set of 30s for a while. It was a namby-pamby thing to do. I fretted over moving up to such "big" tires as 31s. What a waste of time and money. I should have ditched the stock Goodyear GSA 27" street tires and gone straight to the 31s.

The TJ comes with the speedo gear for a 31 already installed. I did not have to change mine. I bought one and when I pulled the still pretty new stock one it was the same color and tooth count. They fully expected us to slap on 31s and stuck the correct gear in the transfer case in anticipation of that. I have never seen or even heard of a speedo gear for the stock 27" itty-bitty things that came on our TJs. The upgrade to the 30" tire package still netted you a speedo gear for a 31" tire. At least this has been my personal experience in making this swap for my two TJs and about ten of my friends. All came with the light blue 31" speedo gear, whether the TJ came with the silly 27" tires or the 30" upgrades.

Run with 31s, OP. You will have no problems. You will gain a half inch of clearance over 30s and have larger contact patches that are still small enough to do well in the snow.

Try some nice BF Goodrich All Terrains. They are great on the road and do very well in most off road situations save for deep, sticky mud, where they sort of suck. The also do not so well in loose, dry sand. Otherwise you will get a lot of miles from them. A lot. They wear like iron and are reasonably priced. They are not cheap but you can afford them.

The two photos show my old 2003 SE 2.4L with BFG AT tires in 31x10.5R15. They fit just fine on all planes.

The second shot is of my two TJs. The left one is the one in the snow photo. The right one is another 2003, but a 4.0L Sport. It has 33x12.5R15 tires. They are the exact same BFGs but with the white letters turned in. I think I like the white better and will turn them back out at some point.

Whatever you decide to do: good luck! And post pics for us to ogle when you get it done, man...

Cheers!
The speedo gear info is new to me. My TJ is dead on with radar that is sometimes set up to try to reduce speeding, and I am running P235's. I am upgrading to 30 x 9.5's because I think stock TJ's look good with 30's or 31's and I wanted to stay with the narrower tire for winter conditions, rather than go to a 10.5" wide tire. .

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