35" Tire on 18" Stock Rim
12-13-2009, 08:42 AM
#1
JK Newbie
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35" Tire on 18" Stock Rim
For a sanity check, will a 35x12.5x18 tire fit on a stock 18" wheel? My 07 Unlimited came with 18" wheels stock and 255 size tires. Who has mounted 35inch tires on these stock rims? I spoke with a local tire supplier and they were very hesitant about installing on a wheel smaller than 8".
12-13-2009, 09:05 AM
#3
JK Junkie
I think he is running a Sahara rim. Some of us have successfully fit up to 12.50 wide tires on our 7.5" wide rims. However, I would stick with a 285 width (or a 11.50 width) to be on the safe side and avoid excessive sidewall flex and tire wear.
I would love to get some 33x12.50 on my 17 inch moab wheels, but I hate tire flex. That means I will be going with a 285/70R17 tire (33x11.50R17). And I can fit in car washes too!
I would love to get some 33x12.50 on my 17 inch moab wheels, but I hate tire flex. That means I will be going with a 285/70R17 tire (33x11.50R17). And I can fit in car washes too!
12-13-2009, 09:08 AM
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I think he is running a Sahara rim. Some of us have successfully fit up to 12.50 wide tires on our 7.5" wide rims. However, I would stick with a 285 width (or a 11.50 width) to be on the safe side and avoid excessive sidewall flex and tire wear.
I would love to get some 33x12.50 on my 17 inch moab wheels, but I hate tire flex. That means I will be going with a 285/70R17 tire (33x11.50R17). And I can fit in car washes too!
I would love to get some 33x12.50 on my 17 inch moab wheels, but I hate tire flex. That means I will be going with a 285/70R17 tire (33x11.50R17). And I can fit in car washes too!
I am running the 35/12.50/18 Mud grappler and have no problems in the car wash. i go thru all the time
12-13-2009, 09:41 AM
#6
JK Junkie
Rail based car wash? I tried it with my 33x12.50 on my cherokee and they stopped me and said it would not fit...
Now the urge to go 12.50 increases slightly. But I wouldn't like the sidewall flexing. how is that anyways?
Now the urge to go 12.50 increases slightly. But I wouldn't like the sidewall flexing. how is that anyways?
12-13-2009, 09:44 AM
#7
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The 18" wheels were optional when we purchased our Jeep in 2007.
Great info Wood. I like the looks of the stock wheels and trying to decide between adding spacers with the stock wheels or going with an aftermarket wheel, downsizing, and probably spending about the same amount.
Great info Wood. I like the looks of the stock wheels and trying to decide between adding spacers with the stock wheels or going with an aftermarket wheel, downsizing, and probably spending about the same amount.
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12-13-2009, 10:42 AM
#8
JK Jedi Master
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It's just amazing the info you can find in the faq's...
But, to the OP, every mfg has a spec list for every tire they make. In that list is their recommended rim width range for that tire. Although the tires can be mounted on narrower or wider rims, and although lots of people do it and have no problems at all, your local shop is well within their rights to decline to mount them for you, as it could turn into a liability issue for them. (not that I have ever heard of it happening, but ya know...)
Q: What are all the factory wheels that are available for the JK?
A:Factory wheel type and sizes listed below:
X Standard
Painted Steel - Size 16 x 7.0
X Optional
Painted Cast-Aluminum - Size 16 x 7.0 (2007)
Painted Cast-Aluminum - Size 17 x 7.5 (2008)
Sahara Standard
Painted Cast-Aluminum - Size 17 x 7.5
Sahara Optional
Painted Cast-Aluminum - Size 18 x 7.5
Rubicon Standard
Machined Cast-Aluminum - Size 17 x 7.5
Backspacing on all factory wheels is 6.25"
Q: What is backspacing?
Q: What back spacing will I need on my wheels in order to clear 12.50 wide tires?
Q: What are wheel spacers?
Q: Are wheel spacers safe to use or do they cause extra stress on your axle or wheel bearings?
A:Factory wheel type and sizes listed below:
X Standard
Painted Steel - Size 16 x 7.0
X Optional
Painted Cast-Aluminum - Size 16 x 7.0 (2007)
Painted Cast-Aluminum - Size 17 x 7.5 (2008)
Sahara Standard
Painted Cast-Aluminum - Size 17 x 7.5
Sahara Optional
Painted Cast-Aluminum - Size 18 x 7.5
Rubicon Standard
Machined Cast-Aluminum - Size 17 x 7.5
Backspacing on all factory wheels is 6.25"
Q: What is backspacing?
Q: What back spacing will I need on my wheels in order to clear 12.50 wide tires?
Q: What are wheel spacers?
Q: Are wheel spacers safe to use or do they cause extra stress on your axle or wheel bearings?
But, to the OP, every mfg has a spec list for every tire they make. In that list is their recommended rim width range for that tire. Although the tires can be mounted on narrower or wider rims, and although lots of people do it and have no problems at all, your local shop is well within their rights to decline to mount them for you, as it could turn into a liability issue for them. (not that I have ever heard of it happening, but ya know...)
12-13-2009, 12:11 PM
#9
JK Junkie
There are several of us running 35x12.5x18 tires on stock 7.5x18 wheels.
I am running KM2s and they are far from looking "stuffed" on the wheel.
The sidewalls are not bulging and the tread is not crowned.
I watched when they were mounted and they mounted and aired up very easily.
Furthermore I tracked their temperature for a while and they do not run hot ( one symptom of running on rim that is too small).
Other tires with wider treads and stiffer sidewalls may experience some crowning.
IMO, it's better to run a rim that is slightly narrow than one that is too wide.
I am running KM2s and they are far from looking "stuffed" on the wheel.
The sidewalls are not bulging and the tread is not crowned.
I watched when they were mounted and they mounted and aired up very easily.
Furthermore I tracked their temperature for a while and they do not run hot ( one symptom of running on rim that is too small).
Other tires with wider treads and stiffer sidewalls may experience some crowning.
IMO, it's better to run a rim that is slightly narrow than one that is too wide.