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Old 08-26-2012, 03:50 PM   #331
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Upsizing tires with stock '13 JKUR wheels?

Maybe this was already covered in this thread, but I still don't have the exact answer to my question. So, please pardon my ignorance and thanks in advance for any input!

I'm (impatiently) waiting for my '13 JKUR to arrive. In the meantime, I'm obsessing over possible upgrades and modifications. Sound familiar? I might be in the minority here, but I kind of like the new Rubicon rims; besides, I don't really want to spend big bucks on new wheels right away. So, my question is whether the stock 17"x7.5" Rubi wheels would accommodate 33" and 35" tires (wider than 10")? I'd need to change backspacing on both, of course, but Spidertrax would take care of that, right? Also, I'm guessing a Teraflex leveling kit would give me enough clearance for 33"s, but that I'd need a real lift for 35"s, right?

Many years ago, I swapped my '97 TJ Sahara's almost-new OEM tires for slightly larger ones at Discount Tire (who gave me a decent trade-in price for 'em), and would probably go the same route this time, if/when I decide to go bigger.

Again, any feedback would be appreciated!

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Old 08-26-2012, 06:45 PM   #332
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Quote:
Originally Posted by LarsA
So, my question is whether the stock 17"x7.5" Rubi wheels would accommodate 33" and 35" tires (wider than 10")? I'd need to change backspacing on both, of course, but Spidertrax would take care of that, right? Also, I'm guessing a Teraflex leveling kit would give me enough clearance for 33"s, but that I'd need a real lift for 35"s, right?
Pretty sure this is all answered in the first post in quite a bit of detail, but yes--you'd need 2 pairs of spidertrax to run any tires wider than about 10.5". You can accommodate 33s without a lift, though you'll rub your fender flares when wheeling. 35s are the same, but more rubbing. I'd recommend going straight to a 2.5" lift, which handles both 33s and 35s reasonably well, and doesn't cause too much geometry alteration.

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Old 08-26-2012, 07:36 PM   #333
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Thanks Mike! Just to be sure: (a) the stock Rubi wheels would be wide enough to accommodate 33x12.50's; (b) I'd need Spidertrax (front & rear) to make this work; and (c) I'd need at least a leveling kit (same as the old TF "Budget Boost" for TJs?) to avoid rubbing. Sound about right?

I guess it would be easier to just swap out tires & wheels (with proper backspacing) at the same time: the cost would also be slightly offset by not having to spend $200 on 2 pairs of Spidertrax. But then I'd probably end up going with 35"s and buying a real lift kit, too (plus lots of other stuff). It's a slippery slope, isn't it?
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Old 08-26-2012, 08:16 PM   #334
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Quote:
Originally Posted by LarsA
(a) the stock Rubi wheels would be wide enough to accommodate 33x12.50's;
Correct.

Quote:
Originally Posted by LarsA
(b) I'd need Spidertrax (front & rear) to make this work;
Correct . . . sort of.

For the rear, they're not really necessary unless your lift ends up raising the sway link connection to the point that it contacts the tire interior. Hard to describe, but it doesn't always happen. Even then though, it'd look weird to have fronts and not rears.

You can usually avoid them altogether by putting washers on the steering stops on your front axle. This reduces your turn radius, however.

Quote:
Originally Posted by LarsA
(c) I'd need at least a leveling kit (same as the old TF "Budget Boost" for TJs?) to avoid rubbing.
A leveling kit might not cut it, depending on just how flexy you get. The TF leveling kit is only 1" in the rear, and I've seen that rub 33s.

The term "budget boost" refers to any hockey puck style lift, including the ubiquitous TF leveling kit.

Quote:
Originally Posted by LarsA
I guess it would be easier to just swap out tires & wheels (with proper backspacing) at the same time: the cost would also be slightly offset by not having to spend $200 on 2 pairs of Spidertrax.
Probably. Also don't forget you'd get to resell your old tire/wheel combo.
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Old 08-26-2012, 09:19 PM   #335
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Quote:
Originally Posted by MTH View Post
Correct.



Correct . . . sort of.

For the rear, they're not really necessary unless your lift ends up raising the sway link connection to the point that it contacts the tire interior. Hard to describe, but it doesn't always happen. Even then though, it'd look weird to have fronts and not rears.

You can usually avoid them altogether by putting washers on the steering stops on your front axle. This reduces your turn radius, however.



A leveling kit might not cut it, depending on just how flexy you get. The TF leveling kit is only 1" in the rear, and I've seen that rub 33s.

The term "budget boost" refers to any hockey puck style lift, including the ubiquitous TF leveling kit.



Probably. Also don't forget you'd get to resell your old tire/wheel combo.
You're the man; thanks for the detailed reply!
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Old 08-27-2012, 04:14 PM   #336
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I have a stock 08 jk currently with stock tires an stock 17 in rims, if i put 33s on 15 in rims will it be the same as stock height? Or will it be a little higher? ( which is what im looking for with out doing that much suspension work)
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Old 08-30-2012, 04:52 PM   #337
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I have an '08 JK and it really needs new tires. I'm pretty new to Jeeps and am not at all mechanically inclined, so I need help! I eventually want to get it lifted (probably 2"), but can't afford right now. So I'm hoping to get something bigger than stock that will work both now and look good once I get it lifted. I found some 255/80/17 (as mentioned above). But I also called a local tire guy and he recommended either a 265/70/17 or a 285/70/17. Any thoughts on these? Any input would be greatly appreciated!!
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Old 09-07-2012, 10:29 PM   #338
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Quote:
A common tire size for the 17” wheel is the 285/70/17.
This is the suggestion in the first post for a recommended backspacing of 4.5.

I like some 17" wheels but the backspacing on them is 4.75. Does it still mean that I could use the 285/70/17 tires on them without any problem on or off road?
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Old 09-10-2012, 07:37 AM   #339
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Absolutely. You can run 285's on 5in back space with no issues.

One question though, I see (in the first thread here too) the stock rims always referenced as being a 6.25in back space. The stock rim is 7.5in with 45mm +ve offset - this is 6in backspace is it not?
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Old 09-12-2012, 06:34 AM   #340
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Quote:
Originally Posted by mohsinkin
This is the suggestion in the first post for a recommended backspacing of 4.5.

I like some 17" wheels but the backspacing on them is 4.75. Does it still mean that I could use the 285/70/17 tires on them without any problem on or off road?
I'm running 295/70-18 Trail Grapplers on rims with 5.14" backspace and +10mm offset with absolutely no rubbing...
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Old 09-12-2012, 04:53 PM   #341
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Originally Posted by mickeymeanie View Post
I'm running 295/70-18 Trail Grapplers on rims with 5.14" backspace and +10mm offset with absolutely no rubbing...
Any lift?
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Old 09-13-2012, 06:21 AM   #342
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Originally Posted by mohsinkin
Any lift?
2.5" Pro Comp Spring lift with Bilstein 5100 shocks...

Discount tire claims they've mounted these tires on stock wheels on stock suspension JK's with only trimming the plastic air dam in front. I have not seen this in person, but based on looking at my set up I have a hard time believing it would work... I suspect without a lift or flat fenders the fenders would get torn off if it was run off road...
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Old 09-13-2012, 09:56 AM   #343
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342 posts in this thread and people are still asking if a 33in tire will fit? really?
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Old 09-14-2012, 10:29 PM   #344
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Originally Posted by smahalik View Post
I have an '08 JK and it really needs new tires. I'm pretty new to Jeeps and am not at all mechanically inclined, so I need help! I eventually want to get it lifted (probably 2"), but can't afford right now. So I'm hoping to get something bigger than stock that will work both now and look good once I get it lifted. I found some 255/80/17 (as mentioned above). But I also called a local tire guy and he recommended either a 265/70/17 or a 285/70/17. Any thoughts on these? Any input would be greatly appreciated!!
Does anyone have any advice on this? Sorry if it seems to be too simple of a question, but (as I said) I'm really new to this and don't know much yet. I would appreciate it if someone has a minute or two for me. Thanks!
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Old 09-17-2012, 09:59 AM   #345
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Originally Posted by smahalik View Post
Does anyone have any advice on this? Sorry if it seems to be too simple of a question, but (as I said) I'm really new to this and don't know much yet. I would appreciate it if someone has a minute or two for me. Thanks!
start with post one and read.
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Old 09-17-2012, 10:46 AM   #346
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Originally Posted by mickeymeanie View Post
2.5" Pro Comp Spring lift with Bilstein 5100 shocks...

Discount tire claims they've mounted these tires on stock wheels on stock suspension JK's with only trimming the plastic air dam in front. I have not seen this in person, but based on looking at my set up I have a hard time believing it would work... I suspect without a lift or flat fenders the fenders would get torn off if it was run off road...
I too have the Pro Comp 2.5" lift Coils and Pro Comp ES9000 shocks with 305/70R18's. Did you origionally use the pro comp shocks and switch to the 5100? If so, could you compare the ride difference from pro comp to bilstein please.

Tom
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Old 09-18-2012, 07:42 AM   #347
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Originally Posted by ontheedge

I too have the Pro Comp 2.5" lift Coils and Pro Comp ES9000 shocks with 305/70R18's. Did you origionally use the pro comp shocks and switch to the 5100? If so, could you compare the ride difference from pro comp to bilstein please.

Tom
No, the 4wheelparts guys suggested the 5100 from the start. That probably tells a lot right there since Pro Comp is their "house" brand. The ride is stiffer than stock for sure, but in my opinion FAR better.
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Old 09-18-2012, 10:33 AM   #348
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start with post one and read.
I have two babies at home and no time to read 300+ posts. I was just asking for a few minutes of someone's time. Thanks for nothing, everyone. Guess I won't be coming back to this forum for help. Too bad, I thought that's what this was here for.
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Old 09-18-2012, 10:47 AM   #349
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Quote:
Originally Posted by smahalik View Post
I have an '08 JK and it really needs new tires. I'm pretty new to Jeeps and am not at all mechanically inclined, so I need help! I eventually want to get it lifted (probably 2"), but can't afford right now. So I'm hoping to get something bigger than stock that will work both now and look good once I get it lifted. I found some 255/80/17 (as mentioned above). But I also called a local tire guy and he recommended either a 265/70/17 or a 285/70/17. Any thoughts on these? Any input would be greatly appreciated!!
Quote:
Originally Posted by smahalik View Post
I have two babies at home and no time to read 300+ posts. I was just asking for a few minutes of someone's time. Thanks for nothing, everyone. Guess I won't be coming back to this forum for help. Too bad, I thought that's what this was here for.
Calm down. This is an internet forum, not a tea party.

He wasn't suggesting you go back and read 300+ posts, just the first one. I've clipped out the relevant portion here, and bolded and underlined the statements relevant to your questions:

Quote:
Originally Posted by 4fit View Post
On Stock Wheels
The largest tire you can fit without a chance of problems on road is a 33x10 tire (also called a “pizza cutter”). An example is the 255/80/17 BFG KM2. Because this tire is the same width as most stock JK tires, there is no issue on road, despite the larger diameter. You can run this size without issue.

Now, let’s consider some tires that could potentially cause slight issues on road; the 33x11s. The common sizes of these would be 285/75/16, 285/70/17, and 275/70/18.

The 275/70/18 measures slightly under 11” wide, while the other two measure a little over. Many folks have reported running these sizes without issue. However, others have experienced contact with the airdam or front suspension components. Simple fixes are to add washers to the steering stops, trim the airdam, or install wheel spacers.

Any tire larger than 11” in width, you are almost guaranteed to have to do one of the above mentioned mods. In fact, if you go too much wider than the 11” tire on stock wheels, you stand a good chance of making contact with your rear swaybar end link. If that is the case, wheel spacers can correct this issue. Common sizes are 295/70/17 (33x11.6), 305/60/17 (33x12), 305/70/16 (33x12), 295/65/18 (33x11.6).
So 255/80/17 (~33x10) looks like a definite fit.

265/70/17 (~31.5x10.5) isn't even a 32" tire, so that's going to be smaller than most stock tires and probably isn't going to look all that good with your upcoming lift.

285/70/17 (~33x11) is probably okay. You might get a touch of rubbing on full lock or some such thing, but generally should be alright. If there are problems, the fixes are pretty easy.
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Old 09-19-2012, 07:02 PM   #350
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So what you're saying is that I CAN put a 37 inch tire on stock suspension!


Just kidding. Trying to make this thread end on a light note.
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Old 09-19-2012, 08:31 PM   #351
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So what you're saying is that I CAN put a 37 inch tire on stock suspension!


Just kidding. Trying to make this thread end on a light note.


Although I know you're being fallacious, the way I would answer that is you can do whatever you want to your Jeep, whether or not it will run is a different story.
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Old 09-22-2012, 12:54 PM   #352
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Lordy, I feel sorry for her husband!
Wow. I'm actually a really nice person and have an awesome husband. Just frustrated with some people on this forum. Don't worry, I won't be coming back due to people like you who feel a need to insult when you don't know me.

MTH, that does answer the question. Unfortunately, by the time I got your answer, I had already gotten my new tires since I waited a while for someone to help and my tires were going bald. As I said before, thanks.
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Old 09-24-2012, 03:30 AM   #353
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ohkhkh
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Old 09-27-2012, 10:04 PM   #354
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354 posts and people still think the stock wheels have 6.25" of backspacing? wow.

They are stamped 44.45mm offset...7.5" width right there on the back of the wheel. Do the math and this does NOT come out to 6.25".

Also, when I measured the 16" steel OE wheels from a base Sport, they were 5.75" backspacing. So in theory, a 285/75-16 on the base Sport wheels will work better than a 285/70-17 on the Sport S/Rubicon wheels.

I have a question about the rubbing with 285/70 on stock wheels with no spacers. WHERE does it rub? Frame? Air dam? Sway link? And why doesn't it rub in the rear? That brake line is AWFUL close with the stock tires. Are you sure there is space inside the fender liner for 285s?

If somebody posted pics of 285/70 on stock wheels with no spacers while flexed out so we could see for our own eyes how close the tolerances are inside the fenders/suspension...it would stop a lot of future questions.
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Old 10-01-2012, 01:30 PM   #355
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Could someone post photos of a non lifted jk with 33x 12.5x 15's?
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Old 10-02-2012, 09:07 AM   #356
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Thumbs up Stock 295/65/18 33" GY on 18" XD Monster

Just had it done yesterday. Stock JKU 2012 with 33" Goodyear Duratracs (296/65/18) on 18" XD Monsters. Rides smooth, very very faint noise above 60-70MPH. I didn't change anything else. I also added the AEV front bumper and the Wild Board front grill.

No rubbing or issues so far. I've seen this setup before on this forum. This is the maximum you can go on with a stock setup. I could have also gone with 275/65/18's and the tires would still have stuck out the side of the fenders. I got the entire setup for $2300. I didn't change the spare though.
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Old 10-06-2012, 07:25 PM   #357
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Jeep Wheel Adapter???

I just recently purchased a set of tires and rims for a 2013 Wrangler for my 2002 Wrangler... I bought 5 tires with the wheels for $400 is there anyway of converting them to fit my 2002 wrangler?
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Old 10-07-2012, 02:00 PM   #358
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Would a 16x8 / Rin 16 x 5.5 with a -6mm offset work on a 2.5 in lift? Looking to put 33s on it. Thanks!
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Old 10-08-2012, 05:44 AM   #359
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I am looking to buy 255/70/18 (32”x10”) new tires and hopefully to be able to get it in ISRAEL. can someone advise me of dealers that can ship it internationaly ?

tnx.
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Old 10-08-2012, 08:10 AM   #360
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Would 16x8" wheels with 5" bs work on a stock suspension. I am looking to put on 33" tires. I understand that the ideal bs is 4.5", but if I was to run a 305/70/R16 would that rub? I know this has been beaten to death but I would still like to hear some thoughts on it. Going from a factory wheel with 6.25"bs to a wheel with 5" bs and going from 10" wide tires to a 12" wide tires... does that make sense? With the increase in diameter of the tire, I could foresee problems. Also, I plan to install a 2" lift and I think that should remove any potential problem I may have. Should I install the lift before the wheels/tires or could I get away with installing the wheels/tires before the lift. I know this has probably been answered before, but I can't find it. I'd appreciate any help/thoughts. Thanks

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