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Discussion Starter #1
I've searched for over an hour. Couldn't find the info in past messages or on any dealer web sites.

I'm looking for the offset for the rims that I have. I have:
D178
17" x 8" cast aluminum wheel
5 lug, 4.50" bolt circle, 5.72" backspacing
Clears 13" brakes




Thanks in Advance!
 

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an hour??????!

http://www.fordracing.com/performan...artType=&VehicleType=&PartNumber=M-1007-D178*

-17" x 8" cast aluminum wheel
-Fits 1994-99 Mustang and 1987-93 Mustang with M-2300-K 5-lug kit
-5-lug, 4.50" bolt circle, 5.72" backspacing
-Includes unique Cobra center cap M-1096-C
-Clears 13" brakes
-Silver metallic clear coat paint

5.72" will get you about a 30mm backspace

you are right pat. I am thinking 9" wheels.

If you want to run wider rims like 9", 24mm front, 36mm back.
 

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Discussion Starter #3
Matt, THANKS!. Yup, over an hour. I found the offset for the R rims:
http://www.afswheels.com/mustang_wheels/index.asp


1979 - 1993 Ford Mustang (converted to 5 lug or SVO) - Again the 17" x 8" (5lug) is the best fit. The back you can choose either 17" x 8" or 17" x 9". We have the 17" x 9" available in both +24mm (5.95-inch backspace) and +36mm offset (6.42-inch backspace). If you have a rear drum conversion and want 17" x 9" on the back, you will want the +24mm. If you have a rear disc conversion, you will want to select the +36mm. The '84-'86 SVO should stick to the 17" x 8" all around. If you choose the 17" x 9" for the rear, your longer bearing housing (hub) will prevent the snap-in center cap from being used.

And, plenty of places that had the backspacing. But, I couldn't find anywhere that specified the offset of the 17x8. I was sure that I could find it. I couldn't.
 

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I don't think +24mm is right, Matt. Should be +31mm:

8" advertised width + 1" wheel lip = 9" total width
5.72" - (9"/2) = 1.22" from mounting face to center of wheel
1.22" x (25.4mm/in) = +31mm offset
 

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Discussion Starter #5
Pat, THANKS!!!

I think that +31mm sounds more in-line. When looking at backspacing and different rim widths (17x8 5.72BS +24mm vs 17x9 6.42BS +36mm vs 17x9 5.95BS +24mm), the D178 seems very close to the 17x9 6.42BS in relationship to where "the wheels are centered" (i.e. offset).
 
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