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post #16 of 40 Old 09-04-2012, 12:02 PM
ColdCase
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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.

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Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #17 of 40 Old 09-04-2012, 12:19 PM
ColdCase
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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.
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Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #18 of 40 Old 09-04-2012, 12:47 PM Thread Starter
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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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post #19 of 40 Old 09-04-2012, 12:56 PM
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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.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #20 of 40 Old 03-26-2013, 08:47 AM
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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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post #21 of 40 Old 04-16-2013, 12:14 PM
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The backspacing is stamped/molded on the back of the wheel. You will need to take a wheel off to see it. Probably a 56.4 offset.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #22 of 40 Old 05-10-2013, 08:47 PM Thread Starter
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2013 JK Wrangler Sahara Wheels

18x7.5
44.45 offset
Now if I hold a tape measure across this, it reads 8-5/8" and the backspacing measured from the wheel mounting face to a straight edge held across the outer edge of the wheel is 6"
Math says that "should" be 5.5" (offset + half the width --- 44.45mm or 1.75" + 3.75" = 5.5")
So ColdCase it looks like our musings last year about the width of the rim bead were spot on.

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post #23 of 40 Old 01-24-2014, 08:20 AM
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Quote:
Originally Posted by WKdeuce View Post
2013 JK Wrangler Sahara Wheels

18x7.5
44.45 offset
Now if I hold a tape measure across this, it reads 8-5/8" and the backspacing measured from the wheel mounting face to a straight edge held across the outer edge of the wheel is 6"
Math says that "should" be 5.5" (offset + half the width --- 44.45mm or 1.75" + 3.75" = 5.5")
So ColdCase it looks like our musings last year about the width of the rim bead were spot on.

Backspace is not offset plus half the width. The width is measured inside the beads, and offset is measure from the outside of the rear bead to the plane of the mounting surface. I find this site to be extremely helpful:

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

If you input the offset it will calculate and display the backspace. If you know the backspace and not the offset, change the offset in the input area until you get the backspace you want.

Roy
2014 Overland, 3.6 L
Fumoto Qwikvalve, Ionic CXV running boards, Michelin X-Ice Xi2 snow tires
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post #24 of 40 Old 01-27-2014, 09:50 AM Thread Starter
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Quote:
Originally Posted by 2kg4u View Post
Backspace is not offset plus half the width. The width is measured inside the beads, and offset is measure from the outside of the rear bead to the plane of the mounting surface. I find this site to be extremely helpful:

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

If you input the offset it will calculate and display the backspace. If you know the backspace and not the offset, change the offset in the input area until you get the backspace you want.
That's what I was saying. Offset and Backspacing will never add up unless you know the dimension of the rim bead. Width and Offset are measured inside the bead, Backspacing is measured outside the bead.
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post #25 of 40 Old 07-16-2014, 02:01 PM Thread Starter
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Most 18s will work. I've had 2 different sets of 18" Sahara wheels on my Overland with the big brakes.

Nice CJ.
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post #26 of 40 Old 08-01-2014, 11:37 AM
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Found this info on another site.

Stock 18" Sahara Wheel = 27 Lbs
Stock Deuler P255 70 R18 = 44 Lbs

Wheel and Tire total = 71 Lbs

Now to find info on the 20" WK2 Overland wheels.

2011 WK2 Overland, 5.7L Hemi, QDII, QL, Volant Intake... more to come.
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post #27 of 40 Old 08-02-2014, 08:29 AM Thread Starter
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Quote:
Originally Posted by falconst View Post
Of those that have already swapped out their OEM WK2 tires for the larger JK Sahara tires, what differences have you seen in MPG?
I've had the stock 20s with 265/50r20 goodyears (30.5x10.5),
JK 18s with 275/65R18 MTRs (32x11),
and now last model year's SRT8 wheels, 20x9 with 275/55r20 Coopers (32x11.5)

I don't have MPG numbers, but I can tell you I have a project in Winchester VA, 414 miles away, with the stock rubber, I could make it down & back in 1 tank. Stock rubber + roof rack cross bars, I'd have to stop for gas. Coopers/MTRs & NO roof rack, I can make it down & back, and lastly fat tires & roof rack, not a chance. Sorry I can't quantify it, but you will see a difference.

Hope that helps.







edit. huh. funny how white it looks until it's got the snow behind it.
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post #28 of 40 Old 08-05-2014, 09:20 AM
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Quote:
Originally Posted by canistel View Post
I've been looking for a while, but can't seem to find anything; does anyone have any tips on a wheel that is 9" wide (instead of the usual 8") and 17" or 18" diameter, while still looking very close in the front appearance to original 17/18 inch rims? So basically, I like the looks of the factory rims but just want a wider rim.
I ran these on my 2006 Limited in the 20" size, but these are 18" x 8.5".

http://www.tirerack.com/wheels/Wheel...All&sort=Brand

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2002 Pontiac Trans Am Firehawk
1991 Pontiac Formula Firehawk
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post #29 of 40 Old 02-02-2015, 04:13 AM
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18" OEM rims, 2015 WK2, Off-Road Adventure II, black powder coat.
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post #30 of 40 Old 02-13-2015, 12:23 PM
ColdCase
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Look at the rear rotors, if they are solid you have SD brakes, if they are vented (venting sandwiched between two solid rotors) they are HD.

You can also look for BR6 in your build sheet

All diesels are suppose to have HD brakes.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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