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Unread 05-29-2012, 03:00 PM   #16
WKdeuce
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Thanks guys. I updated some of the Wrangler & Commander stuff today. For an AWD/4WD machine, the WK2 has a pretty high offset, as far as wheel fitment goes we're in front wheel drive territory, really.

If anyone can add part numbers, official wheel names, backspacing, or offset... or any other corrections, I'd really appreciate it.

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Unread 05-29-2012, 05:31 PM   #17
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FWIW, the 70th Anniversary wheels are also found on the Durango R/T, and the GC Altitude - just painted black.
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Unread 07-18-2012, 11:43 AM   #18
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Quote:
Originally Posted by WKdeuce View Post
17" JK Rubicon
still hunting size info & offset/backspacing

Here you go.

17x7.5
44.45mm offset
6" BS
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Unread 07-19-2012, 07:31 AM   #19
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thanks, list updated.
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Unread 08-06-2012, 08:40 PM   #20
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Surprised no one has added the 2012 SRT 20" wheels.
srt8-wheels.jpg  
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Unread 08-07-2012, 10:26 AM   #21
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arfmmf - Thanks, added. Same specs as the 20" overland wheels? Any numbers on them?
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Unread 09-01-2012, 03:07 PM   #22
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I noticed this site seem to have been updated with more WK2 relevant info:

http://www.rimsntires.com/packages.j...earch&sized=18

Bolt pattern: 5x127 (5x5). Offset: 18 to 45 mm. Tires up to 800x275mm. Rims up to 26x9.5".

The site lets you select stock or lifted.

You can compare rim and tire sizes here:

http://www.rimsntires.com/specs.jsp?item=Wheel-Tire

They say the OEM 18 and 20 inch wheels have a 173 mm BackSpace, 45 mm offset, and 9 inch width

My OEMs are stamped with a 56.4 offset, however.
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Unread 09-02-2012, 07:23 AM   #23
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ColdCase, I'm struggling with this everytime I worth through it on our Jeeps. I'm almost at the point where I don't believe the number stamped in the wheel, but that's absurd.

Backspace is measured with the wheel laying flat on the ground face up, from the ground to the mounting face of the wheel.
Offset, I'm sure you know, is a measurement from the center line.
The problem is, when we say 9" wheel, that's the internal bead mounting surface, not a true cross sectional width, which may be as much as 10" in our case.
Without calculating the mounting width and overall width delta, you cannot correlate backspacking and offset.
For example, using your numbers above:
OEM 20"
6.81" (173mm) backspace
9" (228.6mm) width
1.77" (45mm) offset

half the width, plus the offset, does not equal backspacing:
4.5" (114.3) + 1.77" (45mm) = 6.27" (159.3mm) does not equal 6.81" (173mm), UNLESS, the rim's lip is 0.54" (13.7mm)

try that again with the stamped digits from Mopar
4.5" (114.3) + 2.22" (56.4) = 6.72" (159.3mm) does not equal 6.81" (173mm), UNLESS, the rim's lip is 0.09" (2.3mm)

So, That leaves us with 2 numbers for the width of the wheels lip, one being a half inch, one being 2mm.
The half inch is believeable, the calculated 2mm is based off the numbers from Chrysler.

Maybe JeepCares can come in here and shed some light on this?
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Unread 09-04-2012, 11:44 AM   #24
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I don't think I'm going to shed any light on this at all. FEEL FREE TO CORRECT ME


This is what I always thought (remember, I'm not very technical):

The wheel width is the measurement measure from the inside of each flange (lip), rather than from the outer edges of the wheel.

Offset tells you how far off center the mounting part of the wheel is.

So if you have a 56.4 mm offset – that means the tire is mounted on a “plate” 56.4 millimeters out past the center of the wheel. This actually brings the wheel /tire more under the vehicle. The mounting plate is farther away from the back of the wheel (back of the wheel being the side that faces towards the center of the vehicle – the side you can’t see) than a vehicle with a 45 mm offset.
The offset in cast into the back side of all Chrysler wheels.

Backspacing is the measurement between that mounting surface of the wheel to the back (inside lip) of the wheel - (back of the wheel being the side that faces towards the center of the vehicle as opposed to the front which faces out from the vehicle.)
Backspacing is half the width of the wheel (inside lip) plus the offset.

Some people add spacers to “space” the rim off the hub to get more backspace.
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Unread 09-04-2012, 12:02 PM   #25
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This diagram shows wheel width from inside of bead to inside of bead. It shows offset as the distance from the wheel center line to mounting pad. It shows back space as the distance from the mounting pad to the inside wheel edge.

These are suppose to be 20 inch wheels with 265/50-20 tires, the drawing on the left has a 56mm offset, the one on the right has a 45mm offset. The one on the right would stick out 11mm (0.4 inches) more than the one on the left.

It looks like the backspacing includes the width of the wheel bead but the wheel with does not.

Thats about all I know about wheels... well except that the OEMs are heavy.
wheel-dimentions.jpg  
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Unread 09-04-2012, 12:19 PM   #26
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So if I run through your math, backspace is 1/2 wheel width +offset +bead

Lets say x= bead, so in the wheel on the left 4.5 inch +2.2 inch +x = 7.2 inch. so x= 7.2 -4.5 -2.2 = 0.5 inch

for the wheel on the right 4.5 inch +1.8 inch +x = 6.8 inch. so x = 6.8 -4.5 -1.8 = 0.5 inch

The bead is 0.5 in both cases.

If the wheel offset is 56mm, the backspace must be 184mm, if the wheel offset is 45mm, the backspace must be 173mm, everything else being equal.

I never measured the Jeep wheel, so I dunno how the actual measurements compare. And the OEM wheels are 8 inch width, so the 9 inch examples above are not exactly the same, sorry about that. Below would be an 8 inch width 18 inch example closer to the OEM wheels. Oh and notice that the example tire hangs over the bead, roughly 1 inch.
18inchwheel.jpg  
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Unread 09-04-2012, 12:47 PM   #27
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Quote:
Originally Posted by ColdCase View Post
It looks like the backspacing includes the width of the wheel bead but the wheel with does not.
I could be wrong, but I think backspacing is from the outside lip of the wheel, and offset is from the "inside lip" (advertised width) of the wheel.

I'll edit that post later to reflect 8" width.
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Unread 09-04-2012, 12:56 PM   #28
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Quote:
Originally Posted by WKdeuce View Post
I could be wrong, but I think backspacing is from the outside lip of the wheel, and offset is from the "inside lip" (advertised width) of the wheel.
I think we are saying the same thing but just from different perspectives. I always have to draw a picture.
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Unread 03-26-2013, 08:47 AM   #29
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http://www.ebay.com/itm/20-Inch-Hype...item4171a5fe25

Found these on ebay...is it true that the offset and rim width are different between the front and back wheels? For SRT8 I mean...

Front: 20x9 5x127 offset 34
Rear: 20x10 5x127 offset 50

would those fit on a 2013 overland using stock tires of 265/50R20?
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Unread 03-28-2013, 01:33 PM   #30
WKdeuce
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Quote:
Originally Posted by shekshishekki View Post
would those fit on a 2013 overland using stock tires of 265/50R20?
I'm fairly certain your info is accurate.
You would want a wider tire on the wider wheel, so that the overall profile remains the same. The stock overland tires could be mounted on the SRT8 rear wheels, but they'd have a stretched look to them. Also, I would think that would leave you with different rolling diameters front/rear.
I'm not sure what SRT8 stock tire size is though, I'd bet its staggered like the wheels though.
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