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Old 09-08-2010, 03:32 PM   #1
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Rim/Tire Question

Im sorry if this is a stupid question.

I want to achieve a nice "bump out" look on my new Wrangler with my tires.

I have a new Mountain which has the Rubicon rims/tires combo (17x9) rims.

I have decided that I dont want to do spacers, so I am trying to figure out if I can use the OEM tires and get new rims (17" ers of course) with a different backspacing than stock to make them stick out some (looking for a 1-2" poke out from the fender)

If so, what would be the optimal rim size and backspacing for this? I'm a little ignorant currently on what the different backspacing does with respect to how the rims/tires ride/look on the vehicle.

Thanks for any input.

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Old 09-08-2010, 04:15 PM   #2
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Let me know if you decide to get rid of the tires / rims...

As for the poke - pretty sure many states have regulations on how much "poke" you can have - may want to check that for your state and then that will help drive the wheel / tire combo...

HTH

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Old 09-08-2010, 04:20 PM   #3
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Will do.

I'd rather keep the tires if I can as they seem pretty good.

I'm looking for a rim style like the Cragar Black Soft 8 style just want the wheels to look a little "wider" in the well opening.

I dont truely understand backspacing or offsets enough to understand how (or if its even possible) to do with stock tires.

Thanks.
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Old 09-08-2010, 04:56 PM   #4
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I have these same questions.

Im trying to figure out what kind of backspacing I need for a 35" tire without using spacers.
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Old 09-08-2010, 05:17 PM   #5
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Tire height doesn't affect the backspacing needed on the wheel. Width does. You can't go much over stock tire width on a stock wheel without spacers or they will rub. There are several threads here explaining backspace and offset, but basically backspace is what you'll be concerned with on a Wrangler. All it means is how far from the inside rim on the wheel the mounting surface of the wheel is... Here's a pic to show you how to measure it and may help explain what it is.


Depending on the model Wrangler you have and the stock wheels it came with, the stock backspace will vary between 6.25" to 5". In order to push the tires out of the wheel wells you need to reduce the backspace. This can cause wear on the wheel bearings and other stuff too, but most of us don't mind.... the price you pay for the look you want. Hope this helps..
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Old 09-08-2010, 06:31 PM   #6
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So I have 6" of backspace on the stock rim (which I plan on using, I know I'm one of the few but I really like these rims"), with a 35x12.5 or a 315/70, am I going to rub with a 3.5 inches of lift and no spacers?
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Old 09-08-2010, 07:02 PM   #7
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Most definitely you will rub. Your stock tires are no bigger than 255x 75's if it's a JK, and so they are roughly 32x10's... You go putting another 1.25" on the inside and you are looking for a new set of tires probably before you get home.... you can do it if you put on wheel spacers to reduce the backspace...
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Old 09-08-2010, 07:09 PM   #8
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I thought so but I wasn't sure. I thought the lift might move move things out of the way enough. Thanks for the help.
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Old 09-08-2010, 08:10 PM   #9
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The lift doesn't affect where the wheels sit in relation to the spring perches and control arms, etc. Just raises stuff off the ground more....
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Old 09-08-2010, 10:19 PM   #10
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Tire height doesn't affect the backspacing needed on the wheel. Width does. You can't go much over stock tire width on a stock wheel without spacers or they will rub. There are several threads here explaining backspace and offset, but basically backspace is what you'll be concerned with on a Wrangler. All it means is how far from the inside rim on the wheel the mounting surface of the wheel is... Here's a pic to show you how to measure it and may help explain what it is.

...

Depending on the model Wrangler you have and the stock wheels it came with, the stock backspace will vary between 6.25" to 5". In order to push the tires out of the wheel wells you need to reduce the backspace. This can cause wear on the wheel bearings and other stuff too, but most of us don't mind.... the price you pay for the look you want. Hope this helps..
Thanks for an informative post.

I have the Mountain....which I believe comes with the Rubicon rim/tire combo......which would be 17x7 rims (I believe that I incorrectly said 17x9 in my previous post..... though I dont know what the stock backspacing is for the OEM rims)

So, can I install a wider rim on the stock tires? (as in...can I go 17x9 or 17x8?) or should I stay with the same rime width and decrease the backspacing?

If anyone else has done what I am describing, feel free to show pics or respond..

Thanks again.
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Old 09-08-2010, 10:29 PM   #11
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yes get some steelies in 17x8(4.5 BS) they will fit your stock mtr tires and they will stick out further than stock by roughly 1.5"
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Old 09-08-2010, 11:32 PM   #12
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A wider wheel isn't going to alter the appearance of the tire width by much. It will make it somewhat flatter, but I doubt it's enough to make much difference. How wide a wheel you can have is determined by how wide a tire you have and if you want to be able to air down offroad or not. There are safety recommendations that you can fudge to a degree as far as wheel to tire ratio goes, but you need to consider how the Jeep will be used.

If you tires are 255x70x17's then you wouldn't want to go wider than an 8" wheel, generally speaking.
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Old 09-09-2010, 09:27 AM   #13
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A wider wheel isn't going to alter the appearance of the tire width by much. It will make it somewhat flatter, but I doubt it's enough to make much difference. How wide a wheel you can have is determined by how wide a tire you have and if you want to be able to air down offroad or not. There are safety recommendations that you can fudge to a degree as far as wheel to tire ratio goes, but you need to consider how the Jeep will be used.

If you tires are 255x70x17's then you wouldn't want to go wider than an 8" wheel, generally speaking.
thanks for the input. I was generally trying to widen the rim width now in anticipation of adding a wider tire in the future. (yet still have the backspacing decreased now to give me a little more fuller looking look in the wheel well -- if that makes sense)

Seeing how the stock tire 255 is roughly 10 inches wide, doesnt that mean that I should be able to safely run a 9 inch rim? or am I missing something.
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Old 09-09-2010, 10:02 AM   #14
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It will fit, but you can't airdown. How wide a tire are you considering for the future? How are you planning to use the Jeep? You can run a 12.5" tire on an 8" wheel, in fact it is recommended if you might ever want to airdown for offroading.
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Old 09-09-2010, 10:46 AM   #15
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It will fit, but you can't airdown. How wide a tire are you considering for the future? How are you planning to use the Jeep? You can run a 12.5" tire on an 8" wheel, in fact it is recommended if you might ever want to airdown for offroading.
The Jeep will be a mix of a part time DD (I have a Vette as the other PT of that DD mix

I would like to do some off-roading (nothing extreme.....minor trails, some mud....but my plan is nothing really extreme)

It sounds like the 8 inch wheel might be the best choice if I can run a 12.5 inch tire on it later.

A wider tire (like a 12.5) would def fill the rest of the wheel well out once I get those, so for right now....an 8 inch rim with 4.5 backspacing on the rubi stock tires would be a step in the right direction for when I get new tires.....at least I think that makes sense.

thanks again for the info
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Old 09-09-2010, 10:48 AM   #16
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No problem. And yes it sounds like you have a good plan, at least to me...

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