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Old 02-06-2013, 03:55 PM   #511
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This thread is fantastic. I know it started last year and at the time the MOAB did not exist. Does anyone know if the 17" x 7.5 Black Painted Alum Wheels still have the 6.25" backspace?

I think the Silent Armor tires are nice, and going to be great for this upcoming "blizzard" that is supposed to hit this weekend but I just don't like how "wussy" they look. 245/75R17 is so damned small, not sure why they went with that for a special edition JK.

I was thinking about just getting some 1.5" spacers to push the tires out a bit so they don't look so skinny but then have read spacers can cause alignment and ball joint and other issues.

I would like to go with the 285/70R17 Duratracs without spacers, which seem to be very popular according to this thread, I was just curious if the backspaceing had changed with the new MOAB.

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Old 02-07-2013, 04:53 AM   #512
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Smile Largest Tyre and wheel in the UK

Hi Guys
Thanks for the great information and pages of info. After spending several hours going through them all I am looking for some advice. Yep I know you are thinking the usual request but I just need some expert advice.
I live in the UK and drive a 2009 4 door Unlimited 2.8CRD auto diesel model with the horrible standard 18" wheels running 255/60/18 tyres which i hate. I want to look at running a Cepek wheel either 17 or 18 with the 4.5" off set which seems the advice however i have a few dilemas as below and dont know which is the best solution which I am helping the wealth of knowledge from over the Pond may be able to help. The Jeep will not be used off road mainly because in the UK we have more people than space how we envy you guys in the US!! you lucky people.

Option one Stick with an 18" wheel but change as above
Whats the biggest tyre i can fit 285/65/18? however in the UK we have to be very careful as the wheel cannot stick out from the arch flush yes. My big hate with the standard wheels and tyres is they just do not fill the arches makes the Jeep look like a roller skate. Whatever option whats the impact on my speedo/ diesel consumption and auto box? as in the UK we have more speed cameras than people!!! I have read about have the electronic set up can be changed but not too sure if the inexperienced people in the UK dealerships would have a clue how?

Option two move to a 17" wheel again as above 4.5" off set Cepek version
Again all the above applies

I really hope you guys can offer some answers as I keep going around in circles on this little Island!
many thanks K

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Old 02-07-2013, 06:07 AM   #513
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Sorry guys I do mean back space when I wrote 4.5" not off set sorry!
K
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Old 02-09-2013, 09:21 AM   #514
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Quote:
Originally Posted by wfbill View Post
This thread is fantastic. I know it started last year and at the time the MOAB did not exist. Does anyone know if the 17" x 7.5 Black Painted Alum Wheels still have the 6.25" backspace?

I think the Silent Armor tires are nice, and going to be great for this upcoming "blizzard" that is supposed to hit this weekend but I just don't like how "wussy" they look. 245/75R17 is so damned small, not sure why they went with that for a special edition JK.

I was thinking about just getting some 1.5" spacers to push the tires out a bit so they don't look so skinny but then have read spacers can cause alignment and ball joint and other issues.

I would like to go with the 285/70R17 Duratracs without spacers, which seem to be very popular according to this thread, I was just curious if the backspaceing had changed with the new MOAB.
The backspacing did not change. I put 1.5" spacers on my Moab and it improved the appearence. I'm now looking at duratracs. Im thinking 315's will be too much on a daily driver 2 door. Ill probably go 285. not sure.
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Old 02-09-2013, 06:51 PM   #515
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Wow, there is some great info here. Please correct me if I am wrong. I am wanting to purchase wheels with a 4.75 backspacing. With this I will be able to put 33/12.5/17 tires on my 13 jku without any rub on and off-road?
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Old 02-09-2013, 07:06 PM   #516
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Originally Posted by Torfer
Wow, there is some great info here. Please correct me if I am wrong. I am wanting to purchase wheels with a 4.75 backspacing. With this I will be able to put 33/12.5/17 tires on my 13 jku without any rub on and off-road?
You want 4.75" or LESS. It's a minimum, not a mandate.

Also, 33s--no matter what backspacing they're on--will certainly rub on your fender flares offroad unless you get a lift.

Proper wheel backspacing only keeps the wheels from rubbing some of the components in the wheel well.

In other words, there are two types of "rubbing" you need to be aware of. One (tire width) is addressed by backspacing, the other (tire height) is addressed by a lift.
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Old 02-09-2013, 08:09 PM   #517
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Originally Posted by kevemm View Post
I live in the UK and drive a 2009 4 door Unlimited 2.8CRD auto diesel model with the horrible standard 18" wheels running 255/60/18 tyres which i hate. I want to look at running a Cepek wheel either 17 or 18 with the 4.5" backspacing, which seems the advice, however i have a few dilemas as below and dont know which is the best solution which I am helping the wealth of knowledge from over the Pond may be able to help. The Jeep will not be used off road mainly because in the UK we have more people than space how we envy you guys in the US!! you lucky people.

Option one Stick with an 18" wheel but change as above
Whats the biggest tyre i can fit 285/65/18? however in the UK we have to be very careful as the wheel cannot stick out from the arch flush yes. My big hate with the standard wheels and tyres is they just do not fill the arches makes the Jeep look like a roller skate.
Same as the initial post states: 33 inches. Since you're not gonna take your Jeep off-road, just disregard the issue with possible fender rubbing. Shouldn't be a problem on-road at all.

As for the tires exceeding the fender width...you're gonna need a higher backspacing number to accomplish that. And I really can't tell you what that # is, given the variance in tires, wheels, etc.

Since you're not gonna put a lift on your Jeep, you could very well get by with 4.75" backspacing, or maybe even a bit more...that'll keep your tires tighter to the Jeep body. But there really aren't any guarantees; it's gonna depend largely on the tires you wanna run.

One thing you can do is choose a tire that's ~ 11" wide, rather than one that's 12.5" wide. This will help some, and give you a better chance of keeping the tires within the range of the stock fenders.

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Whatever option whats the impact on my speedo/ diesel consumption and auto box? as in the UK we have more speed cameras than people!!! I have read about have the electronic set up can be changed but not too sure if the inexperienced people in the UK dealerships would have a clue how?
Running bigger tires will affect your gas mileage and power. How much will depend on your Jeep's gearing. The higher gears you have (lower #'s being higher gears), the more of an adverse affect larger tires will have on your power.

You'll need to do one of two things to recalibrate your speedometer (and, by extension, your odometer) to your larger tire size:

1. Have a Jeep dealership flash your Jeep, which will adjust your computer so that your speedo/odo are accurate.

2. Buy a tuner, such as Superchips Flashpaq, or a diagnostic tool such as the Procal (sold by AEV) to flash the Jeep computer yourself. I'm not sure if either of these tools are available to you guys in England...not sure why they wouldn't be, other than the policies of the companies that sell them.

Unless you're looking for performance increases, the best bet would be the Procal. It'll allow you to adjust your speedo for the new tires, as well as lower or disable the sensitivity settings of your TPMS system. Some other handy functions, too.

Here's a link to the product: ProCal Module - Electronics - Shop By Category

Quote:
Originally Posted by kevemm View Post
Option two move to a 17" wheel again as above 4.5" off set Cepek version
Again all the above applies
I'd go with the smaller wheel, personally, as the cost of tires will be far less. Seems odd that less rubber would actually cost less $$, and I'm not sure if that holds true in England, but that's the case here in the U.S. And it's based on the reality that tire companies sell a lot more tires in the smaller wheel sizes...Again, might not be the case in the UK.

Also, the smaller wheel size will save you weight, which will minimize any mpg/power loss.
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Old 02-10-2013, 12:03 AM   #518
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Heres the question I have yet to secure a fact answer for versus a "should work"" reply. 2012 Sahara with 3:21 gears, what is the largest tire size that I can go to with no lift and not hinder my performannce or off set the speedo! More on-road on hilly highways then off-rod at this time.
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Old 02-10-2013, 12:32 AM   #519
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Originally Posted by D.B.
Heres the question I have yet to secure a fact answer for versus a "should work"" reply. 2012 Sahara with 3:21 gears, what is the largest tire size that I can go to with no lift and not hinder my performannce or off set the speedo! More on-road on hilly highways then off-rod at this time.
Stock tire.

Bigger tires drain mpgs, performance, and skew speedo accuracy until the computer is corrected. Not necessarily in big ways, but the effect is there. If you're looking for ZERO impact, the answer is "stock tire."

It's physics.
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Old 02-10-2013, 12:36 AM   #520
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So i have fallen in to a great deal on some Toyo Open country a/t 2's 285/75-16's. I currently have 265/75 and 16X8 rims with 4.5bs. I have a 3/4" front coil spacer on the front. No hard core off roading issue or not 2013jku? seems the toyos are about 32.8" tall and 11.3 wide. I think true mounted height is less tho measured a brand new set on a pickup with the same rims and they appeared around 32" actual.
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Old 02-10-2013, 12:50 AM   #521
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Looking for a little advice, I know I want to stick to a 33" (for now), and am going with the Pro Comp 7069 16" wheel. Where I'm looking for help is the tire, I have narrowed it down to either the Nitto Terra Grappler 33X11.5 or the Mickey Thompson 285X75/16. Thanks in advance for the advise.
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Old 02-10-2013, 01:30 AM   #522
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So i have fallen in to a great deal on some Toyo Open country a/t 2's 285/75-16's. I currently have 265/75 and 16X8 rims with 4.5bs. I have a 3/4" front coil spacer on the front. No hard core off roading issue or not 2013jku? seems the toyos are about 32.8" tall and 11.3 wide. I think true mounted height is less tho measured a brand new set on a pickup with the same rims and they appeared around 32" actual.
You shouldn't have any issues if they're indeed 32" tires. And the 4.5" bs hooks you up, at least in terms of width.

The only issue you might run into is off-road, if you disco your sway bars and hit some serious flex. And that's only if your estimate of 32" is off...it could rub your fenders. Even then, it's not a catastrophic thing.

My guess? You'll have no problems. Remember: 33" tires are gonna want in ~ 30-32 PSI (possibly even less)...far less than most tire shops and dealerships will fill em. They'll squirt about 36 PSI in there (as per the door placard) and call it good. It's not...your Jeep will drive like a turd with that PSI.

30-32. Do a chalk test to get it right on, for optimum tire longevity.

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Looking for a little advice, I know I want to stick to a 33" (for now), and am going with the Pro Comp 7069 16" wheel. Where I'm looking for help is the tire, I have narrowed it down to either the Nitto Terra Grappler 33X11.5 or the Mickey Thompson 285X75/16. Thanks in advance for the advise.
Not sure what you're asking...which one would I recommend?

The Nittos are notoriously heavy; they'll kill your mileage and gearing. The MTs are boutique tires, which means you're gonna get hosed on em in terms of price.

Twist my arm, I'd go with the MTs.
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Old 02-10-2013, 05:10 AM   #523
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Superb Info

many thanks KBWwolf great info really appreciated your guidance.

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Originally Posted by kbwwolf View Post
Same as the initial post states: 33 inches. Since you're not gonna take your Jeep off-road, just disregard the issue with possible fender rubbing. Shouldn't be a problem on-road at all.

As for the tires exceeding the fender width...you're gonna need a higher backspacing number to accomplish that. And I really can't tell you what that # is, given the variance in tires, wheels, etc.

Since you're not gonna put a lift on your Jeep, you could very well get by with 4.75" backspacing, or maybe even a bit more...that'll keep your tires tighter to the Jeep body. But there really aren't any guarantees; it's gonna depend largely on the tires you wanna run.

One thing you can do is choose a tire that's ~ 11" wide, rather than one that's 12.5" wide. This will help some, and give you a better chance of keeping the tires within the range of the stock fenders.



Running bigger tires will affect your gas mileage and power. How much will depend on your Jeep's gearing. The higher gears you have (lower #'s being higher gears), the more of an adverse affect larger tires will have on your power.

You'll need to do one of two things to recalibrate your speedometer (and, by extension, your odometer) to your larger tire size:

1. Have a Jeep dealership flash your Jeep, which will adjust your computer so that your speedo/odo are accurate.

2. Buy a tuner, such as Superchips Flashpaq, or a diagnostic tool such as the Procal (sold by AEV) to flash the Jeep computer yourself. I'm not sure if either of these tools are available to you guys in England...not sure why they wouldn't be, other than the policies of the companies that sell them.

Unless you're looking for performance increases, the best bet would be the Procal. It'll allow you to adjust your speedo for the new tires, as well as lower or disable the sensitivity settings of your TPMS system. Some other handy functions, too.

Here's a link to the product: ProCal Module - Electronics - Shop By Category



I'd go with the smaller wheel, personally, as the cost of tires will be far less. Seems odd that less rubber would actually cost less $$, and I'm not sure if that holds true in England, but that's the case here in the U.S. And it's based on the reality that tire companies sell a lot more tires in the smaller wheel sizes...Again, might not be the case in the UK.

Also, the smaller wheel size will save you weight, which will minimize any mpg/power loss.
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Old 02-10-2013, 12:06 PM   #524
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You shouldn't have any issues if they're indeed 32" tires. And the 4.5" bs hooks you up, at least in terms of width.

The only issue you might run into is off-road, if you disco your sway bars and hit some serious flex. And that's only if your estimate of 32" is off...it could rub your fenders. Even then, it's not a catastrophic thing.

My guess? You'll have no problems. Remember: 33" tires are gonna want in ~ 30-32 PSI (possibly even less)...far less than most tire shops and dealerships will fill em. They'll squirt about 36 PSI in there (as per the door placard) and call it good. It's not...your Jeep will drive like a turd with that PSI.

30-32. Do a chalk test to get it right on, for optimum tire longevity.



I did just order some jks discos but I doubt I will be seriously flexing anytime soon if ever. most rides are just unimproved forest service type roads not rubicon trail type stuff. Right now I have 265/75 E rated tires and I am amazed at how nice it rides at 35psi so I hate risking that aspect of things. I do think the bigger rubber would look better tho. The 285's weight ~6lbs more then the 265's at 53 vs 47 lbs and my rims are ~25lbs so not too excessive but not light weights either. Wish I could find a little more feed back on Toyo Open country a/t2's not much out there yet. thanks jeff
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Old 02-10-2013, 03:10 PM   #525
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Speaking of dealer tire pressure. I recently picked up a 2013 unlimited moab that drove hard. They filled the tires to 41psi cold with ambient temp around 30 degrees. Door jams say 35psi cold... Is this common with the jeep service dept? My first jeep. Dropped the psi and 100% nicer ride. Planning on multi step/wheel upgrade:

Immediately: 1.5' wheel spacers for looks
For spring: 2.5 lift
Summer: Larger tires for stock rims taking tires from ~32 to a wider 33"

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Old 02-12-2013, 07:55 PM   #526
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Tire and Rim on a stock set up

I have a brand new 2013 wrangler sport. everything is stock on it. I was wanting to know if a pro comp 7069 series rim would work with a with a BF Goodrich all-terrain T/A 265/75r16 tire would work with out having to use any spacers or any type of lift kit. The dimensions of the rim are 16X8 with 4" backspacing. im guessing the 265 is right around a 31 inch tire.
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Old 02-12-2013, 08:35 PM   #527
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I have a brand new 2013 wrangler sport. everything is stock on it. I was wanting to know if a pro comp 7069 series rim would work with a with a BF Goodrich all-terrain T/A 265/75r16 tire would work with out having to use any spacers or any type of lift kit. The dimensions of the rim are 16X8 with 4" backspacing. im guessing the 265 is right around a 31 inch tire.
I currently have 265/75-16's on 16X8 rims with 4.5 back spacing and have a ton of room with no lift. I did the ramp to see how close I was and not close anywhere.
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Old 02-12-2013, 11:28 PM   #528
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Tire and Rim on a stock set up

awesome if my math is right i believe that makes the tire just a tad over 31 inches correct
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Old 02-13-2013, 12:13 AM   #529
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supposed to be 31.6" per the tire manufacurer but mine at 32psi are 31" at most.
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Old 02-13-2013, 11:21 PM   #530
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Hello.I am new to wranglers and i have read thread after thread and still cannot really get a straight answer as far as backspacing and fitting certain wheels w/ tires on my stock JK..I have a 2013 JK SPORT S...i do not plan on lifting or putting on wheel spacers..and will nvr offroad at all..can anyone let me kno which combo below would be the best fit for my stock jk with no rubbing or damaging anything..Also is anyone running any of these stock that can help me out..Thank a lot!
(I am open to any of these i just dont kno which would work best)

KMC Rockstar XD..17x8..(4.9 bs +10mm offset)265/70/17 Duratrac
KMC Rockstar XD..17x9..(4.5 bs -12mm offset)285/70/17 Duratrac
KMC Rockstar XD..18x9..(5.0 bs 00mm offset)275/65/18 Duratrac
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Old 02-15-2013, 01:00 AM   #531
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Ok, maybe I am just missing it, tired eyes... I have become a Wrangler Forum Junkie... *twitch* But just what width is the stock 16" wheel on the 2013 Unlimited Sport? 16x7? 16x8? Thinking that those wheels/tires will be the first thing to go!

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Old 02-15-2013, 10:39 AM   #532
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Ok, maybe I am just missing it, tired eyes... I have become a Wrangler Forum Junkie... *twitch* But just what width is the stock 16" wheel on the 2013 Unlimited Sport? 16x7? 16x8? Thinking that those wheels/tires will be the first thing to go!

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stock steelies are 16X7 with 6.25 backspacing. You can run 265/75-16 on them but not much bigger.
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Old 02-15-2013, 10:46 AM   #533
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I did go with 285/75-16E toyo open country at2's and like the look and no noticable power loss with my 2013 jku and 3.21 auto. Everybody says toyos are too heavy but these came in at about 50lbs and 25lbs for my rims so no heavier then stock rubi set up. I had no problem placing the spare on the back carrier. E rated but ride extremely smooth at 34psi.
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Old 02-15-2013, 05:20 PM   #534
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I did go with 285/75-16E toyo open country at2's and like the look and no noticable power loss with my 2013 jku and 3.21 auto. Everybody says toyos are too heavy but these came in at about 50lbs and 25lbs for my rims so no heavier then stock rubi set up. I had no problem placing the spare on the back carrier. E rated but ride extremely smooth at 34psi.

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Old 02-15-2013, 06:08 PM   #535
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stock steelies are 16X7 with 6.25 backspacing. You can run 265/75-16 on them but not much bigger.
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Old 02-15-2013, 08:16 PM   #536
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So I got the P285/70R17 Coopers put on today. I cannot detect any rubbing. The guy at the installer said he barely picked up a sound when pulling tightly into a parking spot.

I should be okay for now since I have no plans for offroading at least until the spring. I think I am going to push forward with a lift, most likely a 2.5" one from AEV or Rock Krawler. I imagine that won't solve my rubbing issues though since it is the crappy backspacing on the stock rims that is the issue, right?
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Old 02-16-2013, 09:46 AM   #537
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So I got the P285/70R17 Coopers put on today. I cannot detect any rubbing. The guy at the installer said he barely picked up a sound when pulling tightly into a parking spot.

I should be okay for now since I have no plans for offroading at least until the spring. I think I am going to push forward with a lift, most likely a 2.5" one from AEV or Rock Krawler. I imagine that won't solve my rubbing issues though since it is the crappy backspacing on the stock rims that is the issue, right?
Correct. The lift will allow bigger diameter tires. Back spacing helps with wider tires. Post some pics of the Coopers.
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Old 02-16-2013, 03:59 PM   #538
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Here are a couple of pics. It is winter, sorry for the mess!
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Old 02-16-2013, 11:04 PM   #539
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would a 285/75/16 fit without any spacers if they are on a 16x8 rim with 4 inch backspacing?
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Old 02-16-2013, 11:11 PM   #540
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Originally Posted by Chief90
would a 285/75/16 fit without any spacers if they are on a 16x8 rim with 4 inch backspacing?
Yes.

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