Stock Back Spacing and Off Set - Jeep Commander Forums: Jeep Commander Forum
Wheels / Tires This section contains discussion about wheels and tires for your Jeep Commander.

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post #1 of 22 (permalink) Old 10-22-2008, 07:33 PM Thread Starter
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Stock Back Spacing and Off Set

I am just curious if anyone has actually taken a stock wheel and measured to figure out what the back spacing is. If not does anyone know the exact back spacing and what the off set of the stock wheels are if there is any? I searched but only found info on the bolt pattern which I already knew. Im trying to see if ill have to do any modification to fit some 295/70R17's on a certain size wheel without it rubbing the ball joint bolt and inner wheel well.




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete
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post #2 of 22 (permalink) Old 10-22-2008, 07:46 PM Thread Starter
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I just found a few pictures of Phunkeydudes Commander in the Uni-ball thread which answered one of my questions. He is basically running the same setup i plan on running with the super lift and a custom spacer. In the photos it clearly shows plenty of room between the tires and the ball joint bolt due to the longer steering knuckles of the 4 inch superlift. So i dont think ill have any problems with the wheels im looking at using, but still need to know the stock back spacing and off set.




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete
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post #3 of 22 (permalink) Old 10-22-2008, 07:49 PM
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Quote:
Originally Posted by 07JeepXK View Post
I am just curious if anyone has actually taken a stock wheel and measured to figure out what the back spacing is. If not does anyone know the exact back spacing and what the off set of the stock wheels are if there is any? I searched but only found info on the bolt pattern which I already knew. Im trying to see if ill have to do any modification to fit some 295/70R17's on a certain size wheel without it rubbing the ball joint bolt and inner wheel well.
Well, this is the best I have been able to find.
There is a optional steel wheel specifically for the XK.
Part# 52124455AA Steel wheel
17"X 7.5" 47.3 MM offset
I found this info in the 08 accessory book

Now, I know you are hoping for a backspace measurement but this is the best I've been able to get.
Offset and backspace have always meant the same thing to me IE: The distance from the rim inner to the inner flange side of the rim
Usable info?
........Rob


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post #4 of 22 (permalink) Old 10-22-2008, 08:24 PM Thread Starter
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Thanks for the help. There is a difference in back spacing and off set on a wheel. The Back spacing is the distance from the mounting surface of the wheel (the flat surface that mounts to the brake rotor) and the inside edge of the wheel. That number in inches is the back spacing. The smaller the number the further the wheel will stick out. The larger the number then the wheel will tuck inside the wheel well.

Now the offset is a little different. A wheel with 0 (zero) off set means that the flat surface that mounts to the rotor is exactly centered in the middle of the wheel. If it has + or - off set then its not centered. Off set also plays a little factor in how much or how little a wheel can stick out or push into the wheel well. Our stock wheels have major off set since the mounting surface is towards the outer portion of the wheel in comparison to the center of the wheel.

I hope i have not confused you. Its really hard to explain back spacing and off set.




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete
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post #5 of 22 (permalink) Old 10-22-2008, 08:27 PM Thread Starter
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BTW i was just on the Superlift website looking at the lift and it says the stock wheels have approx. 6.5 inches of backspacing. With that info and the off set you gave me I now have the answers to all of my questions. Thanks for help and quick response!




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete
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post #6 of 22 (permalink) Old 10-22-2008, 08:31 PM
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someone did a long dissertation some time ago about back spacing.


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post #7 of 22 (permalink) Old 10-24-2008, 02:40 AM
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The question is, why is one in inches and the other in mm?

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post #8 of 22 (permalink) Old 10-24-2008, 05:49 AM
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Quote:
Originally Posted by keef_7 View Post
The question is, why is one in inches and the other in mm?
Well, we've been doing this half a$$ed domestic/metric measuring game in the U.S.A. for about 20 years now.
As a result, I must own tools that cover the inch spectrum AND the metric spectrum.
It gets worse.
Mechanics from my age group (+55) still express backspace as a letter code.
For example, A 5x5 1/2, 15 x 8--Double J offset
Thats a 5 STUD/ 5.5 stud diameter, 15" wheel diameter, 8" wide, flange center (the double j) rim.
So, I get to try to cipher this from time to time.
Can become the job that ate my brain!

Hope (LOL) that clarafied,
.........Rob


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post #9 of 22 (permalink) Old 10-29-2008, 11:48 AM
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i am curious what wheel will fit best and if i would still need a spacer.
1.17x9, 5 on 5 Bolt PatternBackSpace 4.75 in.Max Load = 2200lbsFinish = Cast BlastHub Centric = NoOffset = -6 mm
2.17x8, 5 on 5 Bolt PatternBackSpace 4.5 in.Max Load = 2200lbsFinish = Cast BlastHub Centric = NoOffset = 0 mm

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post #10 of 22 (permalink) Old 10-29-2008, 12:47 PM
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if your ordering new rims why not just order more backspacing and not worry with the spacers

looks like if you order a set of wheels with 8inches of backspacing (6.5 stock + 1.5 spacer) you will have what you want
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