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Old 01-02-2011, 12:24 PM   #1
Exotic_Car_Guy
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Question Widest tire on a 928

I bought a set of Porsche Carrera IV wheels with the following dimensions:

Front: 8 x 18 et 57
Rear: 10.5 x 18 et 60

What would be the right tires for my '85 928S? I'd like to go widest possible in the rear 10.5" wheel without rubbing (and closest to orig overall wheel/tire diameter).

Thanks,
Gil
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Old 01-02-2011, 12:29 PM   #2
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295/30. It will be a squeeze to get it in there.
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Old 01-02-2011, 01:08 PM   #3
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Very interested to see what these look like on the car.
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Old 01-02-2011, 01:16 PM   #4
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Quote:
Originally Posted by 123quattro View Post
295/30. It will be a squeeze to get it in there.
When you say a squeeze, will there be rubbing with suspension travel during driving (bumps, etc.)?

Gil
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Old 01-02-2011, 01:35 PM   #5
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They will probably fit, but you will need a ~5mm spacer with those 60mm offset rear wheels. Also, you may need to pull out the rear fenders just a little, but that is quite easy since they are steel.

Dan
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Old 01-02-2011, 01:59 PM   #6
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285/30/18 with no spacers will fit nicely.
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Old 01-02-2011, 02:07 PM   #7
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There will also be a difference in width, depending on tire brand. My wheels had P-Zero's 295/30/18 on an 11.5 rim and rubbed like crazy. Put on my Kumhos of the same size, I now have 1/4 inch more room between the fenders/tire than I had previously. They my say they are the same size, but there are a lot of variations on side wall width.
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Old 01-02-2011, 02:47 PM   #8
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Side to side suspension tolerances are NOT the same........ one side is always tighter than the other.......

I run 275x35x18s on the rear of my 89 GT and one side is definately closer to the fender than the other.
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Old 01-02-2011, 02:56 PM   #9
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Thanks guys for all your inputs.
Gil
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Old 01-02-2011, 06:11 PM   #10
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Quote:
Originally Posted by Gretch View Post
Sid to side suspension tolerances are NOT the same........ one side is always tighter than the other.......

I run 275x35x18s on the rear of my 89 GT and one side is definately closer to the fender than the other.
I've noticed the same thing too. I thogth it was probalby caused by an accident at some point in the car's life but, mabye it isn't.
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Old 01-02-2011, 06:11 PM
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