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Topic Review (Newest First)
01-24-2015 12:45 PM
Gruson Update, it looks like the 18" Altitude wheels are:
Size: 18x7.5
Lugs: 5
Bolt Pattern: 5 Inch
Offset: 44.45mm

Should the 275/70/18 Duratracs work for them and give me a 33.2" tire and no rub with a 2" lift? Thanks!
01-24-2015 04:05 AM
Gruson I was looking at the 275/70/18 for my Jeep. I own the 2014 Jeep Wrangler Unlimited Altitude. It had the 18" size black wheels and I just love them. I'm getting the Mopar 2 inch lift and really want the Duratracs that are slightly bigger than 33". I think they measure 33.2" and are 275/70/18. I can't find the exact size of the 18" Altitude wheel though. Will this tire work? I would think with the lift it would but not sure. I'm not even sure is the tire will fit on the wheel really. Any ideas? Can't find much info on the Altitude wheels. Thanks.
01-16-2015 04:51 PM
seannaz Ok - what are chances 35/12.5/17 would fit with zero lift, but flat fenders on a 15JKUWW? Totally screwed or doable?
01-13-2015 02:57 PM
richj I put 275/65/18's on my '13 Sara and had to put several washers on the wheel stops and I still get a slight rub with the wheels fully turned, but otherwise haven't had any issues. Wheel spacers would work too.
01-13-2015 12:38 AM
FingerTight
Quote:
Originally Posted by dools View Post
I read through the thread a little but not everything, and I am sorry if this is already answered. I am new to jeeps and should be picking up my 2015 wrangler unlimited sahara on Saturday. Will an 18x9 wheel with 0mm offset and 5" backspacing with 275/70/18 tires fit on stock suspension without rubbing. The jeep will only be used for street use. From what I read and understand it should fit right? Could i even get bigger tires?
Are you talking about the stock Sahara wheels or something aftermarket? I think 275/70/18 on the stock wheels should work fine, just an educated guess though.
01-13-2015 12:11 AM
dools I read through the thread a little but not everything, and I am sorry if this is already answered. I am new to jeeps and should be picking up my 2015 wrangler unlimited sahara on Saturday. Will an 18x9 wheel with 0mm offset and 5" backspacing with 275/70/18 tires fit on stock suspension without rubbing. The jeep will only be used for street use. From what I read and understand it should fit right? Could i even get bigger tires?
01-12-2015 09:41 AM
FingerTight
Quote:
Originally Posted by NYCityCrawler View Post
Hey, I'm new to modifying my jeep, not new to jeeps. I was told that I could fit a 325 tire on a stock JKU if I got a Teraflex leveling kit. What does the leveling kit do exactly and is this true. If so what would be the other tire dimensions if I wanted 17" rims. I also plan to buy flat fender flares to increase clearance if that matters. Would this tire rim combo fit on my stock carrier. Any help would be appreciated. Thanks
Most of this info is available in this thread and others on the TF kit. In short: A 325 tire is almost 3" wider than the stock 255. I don't see any 325s on the DTD site so not sure what height you're looking at. Have to assume it's going to be taller though.

Ok, so you're looking at a tire 3" wider and probably 2" taller, you will absolutely rub in a number of places. The inside of the tire will rub on suspension components and the air dam, the tread will rub the fender flares as it flexes, maybe even if you hit a speed bump.

Solutions would be a lift kit to clear the fenders better along with spacers or different wheels to push the tires out away from the frame and suspension. Flats will certainly help flex clearance too. This is a thread about stock JK tires though
01-11-2015 09:26 PM
NYCityCrawler Hey,
I'm new to modifying my jeep, not new to jeeps. I was told that I could fit a 325 tire on a stock JKU if I got a Teraflex leveling kit. What does the leveling kit do exactly and is this true. If so what would be the other tire dimensions if I wanted 17" rims. I also plan to buy flat fender flares to increase clearance if that matters. Would this tire rim combo fit on my stock carrier. Any help would be appreciated. Thanks
01-11-2015 11:46 AM
FingerTight Another thought: the more centered the rotating mass is over the pivot point, the easier it is going to be to steer. With the rotating mass moved off center it won't pivot as much as it will move in an arc.

I'm sure you're right about the cost side too. The lighter duty construction the cheaper to manufacture. No doubt Jeep engineers the system to be as safe and cheap as possible...maybe not in that order

As for keeping the tires under the fenders, simply narrowing the axle an inch would do that so I doubt that plays a role in the wheel offset design.
01-11-2015 11:43 AM
FingerTight I've read a lot of this info in other threads here. As I understand it it's as simple as leverage. With the bulk of the rotating mass spinning around a point inside the end of the axle (and steering components) the force needed to change direction (steer) is reduced. The more that rotational mass is moved outward and cantilevered off the end of the axle, the more leverage it has to overpower the steering components. Add in heavier rotating mass and increased friction due to wider contact patches and you can get into trouble fast.
01-11-2015 11:04 AM
jgkoch75 Or is it something as simple as keeping the tires under the fenders?
01-11-2015 11:02 AM
jgkoch75 Like FingerTight says, there must be an engineering or other deliberate design reason for using 6.5" backspacing. It must have something to do with ideal mating with the other components involved in the axle and wheel housing, plus I would think that the backspacing choice distributes the weight best on a Wrangler...something like that?

I freely admit to my ignorance on the issue of rim design and what backspacing and offset are best for different vehicles, but I suspect that Jeep uses the high backspacing for a very specific reason (which usually equates to saving money).

As discovered through this thread, any diameter above 33" or width over 11" (especially incorporating both larger measurements) runs the risk of rubbing the Wrangler the wrong way. And so, stock Wranglers will not come from the factory with anything over the 255/75r17 size (255/70r18 on the Sahara is identical in size, other than a smaller sidewall). Plus, there are reports that certain 15" steel rims will not fit the Wrangler brake calipers (someone correct me if that is wrong or incomplete), but I do not know if that is a backspacing issue.

That being said, there is a significant difference in size between the stock 225/75r16 (29.3"x8.86") that come on the base Sport, and the 255/75r17 (32.1"x10.04") on the rest of the Wranglers. Jeep also offers special packages with different sized tires (245/75r16 for the Sport; the Sahara X comes with 245/75r17 Silent Armors). The constants seem to be the 6.5" backspacing and the max tire size of ~32"x10".

Does Jeep use 6.5" backspacing on their other vehicles?
01-10-2015 09:24 PM
Number8
Quote:
Originally Posted by jgkoch75 View Post
Everyone always talks about 4.5" backspacing as being ideal for increasing wheel size, but all Wrangler wheels (as far as I know) come stock with 6.5" backspacing. There must be a reason for this -- other than to force anyone who wants to go bigger to buy new rims?
Keeps the tires neatly under the fenders. Doesn't allow for much width, though, when you turn the wheel.
01-10-2015 06:10 PM
FingerTight
Quote:
Originally Posted by Martini87 View Post
Most vehicles do not come with deep dish rims/ higher offsets. They are just following the standard of every other manufacturer. Customization is something Jeepers do more than most, but it is just that. Customization. To Jeep, the wrangler is VERY capable for being "stock"
I'm going to guess there's an engineering reason as well. Having the entire wheel / tire assembly rotating around the axle tube is likely a much more stable and safe setup than having some or all of the wheel / tire assembly leveraged out past the end of the mating surface. I believe this will effect the scrub radius which in turn effects the tire's self centering etc. I'd bet $1 that a lot of the "death wobble" could be attributed to non stock wheel offset.
01-10-2015 05:33 PM
Martini87
Quote:
Originally Posted by jgkoch75 View Post
Everyone always talks about 4.5" backspacing as being ideal for increasing wheel size, but all Wrangler wheels (as far as I know) come stock with 6.5" backspacing. There must be a reason for this -- other than to force anyone who wants to go bigger to buy new rims?
Most vehicles do not come with deep dish rims/ higher offsets. They are just following the standard of every other manufacturer. Customization is something Jeepers do more than most, but it is just that. Customization. To Jeep, the wrangler is VERY capable for being "stock"
01-10-2015 02:35 PM
407guy Indeed Em52. I used that link myself to help me decide on my new wheels and tires. See my post # 1361.




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01-10-2015 11:55 AM
Em52
Quote:
Originally Posted by jgkoch75 View Post
Everyone always talks about 4.5" backspacing as being ideal for increasing wheel size, but all Wrangler wheels (as far as I know) come stock with 6.5" backspacing. There must be a reason for this -- other than to force anyone who wants to go bigger to buy new rims?
This is a site that helped me understand the offset/spacing when selection wheels...

http://www.rimsntires.com/specspro.jsp

Em ...
01-10-2015 10:28 AM
FingerTight
Quote:
Originally Posted by jgkoch75 View Post
Everyone always talks about 4.5" backspacing as being ideal for increasing wheel size, but all Wrangler wheels (as far as I know) come stock with 6.5" backspacing. There must be a reason for this -- other than to force anyone who wants to go bigger to buy new rims?
Sounds like a new thread but, yes, I have to think there is and I've wondered the same!
01-10-2015 10:21 AM
jgkoch75 Everyone always talks about 4.5" backspacing as being ideal for increasing wheel size, but all Wrangler wheels (as far as I know) come stock with 6.5" backspacing. There must be a reason for this -- other than to force anyone who wants to go bigger to buy new rims?
01-10-2015 08:29 AM
willbarrow81
Quote:
Originally Posted by bmarquard View Post
have a 2011 JK and was wondering if 31X10.5 tires with 15 inch rims would fit without getting a lift?

Apologize in advance if topic has been discussed already. Long time jeep owner but always had the luxury of purchasing jeep already lifted until now.

Thanks!!!
Yes, you should be fine, I believe that the proper back spacing is 41/2 foe our jks mines a 2010 and everything I've read says 4 and 1/2" back spacing! Its got something to do with the brakes like the calipers I think.
01-08-2015 11:56 PM
DWDK
Quote:
Originally Posted by Naked Jeep Girl View Post
I understand the factory put it there for a reason, but I also noticed not a single aftermarket front bumper has an airdam. Also adding a winch has got to block the radiator from cooling way more than simply removing that cheap ass plastic dam. Thanks for answering.
That's because the air dam IMO is mostly to block water/debris from flying up into the engine bay. This isn't a narrow snout car with out a grill that needs assistance. Jeeps have plenty of open grill that allows are into the rad.
01-08-2015 11:43 PM
bmarquard have a 2011 JK and was wondering if 31X10.5 tires with 15 inch rims would fit without getting a lift?

Apologize in advance if topic has been discussed already. Long time jeep owner but always had the luxury of purchasing jeep already lifted until now.

Thanks!!!
01-07-2015 11:19 PM
birddogn We have had quite a snow storm here in Central Montana. I took JADMT's advice and had our stock Rubicon BFG's siped and they are awesome in the snow and seem fine on the ice. They are working out pretty good for us this winter.
01-05-2015 04:42 PM
Martini87 I am getting 305/70/17s with 4.75 backspacing on no lift. It will not be off-road at all on these tires, mostly because it's my DD. Once I can afford the lift, things will change

I will post pics when they are on. My only question though, am I going to need to change out the spare tire carrier? Any advise on a cheap way to go with this if so?

Thanks!
01-04-2015 04:13 PM
Naked Jeep Girl I think the 295's will be fine, you have options on trimming the air dam or removing it altogether. Don't forget you can also get a set of wheel spacers and be good to go..
01-04-2015 04:20 AM
Naked Jeep Girl
Quote:
Originally Posted by gecko4 View Post
The air dam is designed to create a low pressure point behind the radiator. That helps pull air through the rad to aid in cooling. Not saying you'll have issues, just that there is a reason it's there.

I understand the factory put it there for a reason, but I also noticed not a single aftermarket front bumper has an airdam. Also adding a winch has got to block the radiator from cooling way more than simply removing that cheap ass plastic dam. Thanks for answering.
01-03-2015 11:09 PM
darrenw
Quote:
Originally Posted by darrenw View Post
hi i have a 2011 jk im putting on some kmcxd 20"rockstar rims offset +35,want to put some 285/55/r20 dune nitto tyres
clearance should be fine(road use ) but was wondering whether they will stick out past the guards ?
would i be rubbing and stick out with a 295?
just not sure cos of the offset being +35 and the rim being 8.5 instead of 7.5 ,does this balance it all out ?extra half inch on the inside of the rim and pushed out 10mm with the offset being 35 instead 45?
01-02-2015 09:05 PM
407guy On 30-Dec-2014 I had 18x9 wheels installed with 305/60/18 tires. See signature. That comes to about 33x12x18. All stock set-up with this combination.








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01-02-2015 05:07 PM
jadmt
Quote:
Originally Posted by darrenw View Post
hi i have a 2011 jk im putting on some kmcxd 20"rockstar rims offset +35,want to put some 285/55/r20 dune nitto tyres
clearance should be fine(road use ) but was wondering whether they will stick out past the guards ?
noooooooooooooooooooooooooooooooooooo
01-02-2015 05:00 PM
darrenw hi i have a 2011 jk im putting on some kmcxd 20"rockstar rims offset +35,want to put some 285/55/r20 dune nitto tyres
clearance should be fine(road use ) but was wondering whether they will stick out past the guards ?
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