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Join Date: Mar 2004
Location: Anchorage, Alaska
Posts: 30
Wheel Offset

How do I determine the correct offset on a set of used 7Jx15 and 8Jx15 wheels for my 76 turbo? Thanks

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Old 10-13-2005, 08:37 AM
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Join Date: Mar 2002
Location: Winlaw, BC, Canada
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Post the numbers that are cast/stamped on the inside. Should be:
For the 7 = 911 361 020 41 Offset 23.3mm
For the 8 = 911 361 020 42 Offset 10.6mm

If your numbers are different, post them here.
I believe that turbo's have 7 front/ 9 rear wheels from factory unless the rear was an 8 in '76.
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Old 10-13-2005, 08:52 AM
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Thanks for the info. I got the wheel sizes out of a book on Porsches. When I bought my 76 Turbo, there were 16" wheels on it and they are too tall so I am going back to the originals. I have not seen any 9x15s in my search. Has anyone heard of this size?
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1976 930, mostly stock
Fly fast, drive fast!
1.19 Mach is my record
Love my 930
Hate Seattle traffic
Believe in the 10% rule
Old 10-13-2005, 09:04 AM
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Just look on the back of the wheels for ET###

Sorry this one is upside down, but the ET identifies it as a 944 8x16 w/ 23.3mm o/s. Appropriate for the front of a 911

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Old 10-13-2005, 09:30 AM
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