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Old Nov 1, 2023 | 02:57 PM
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Mezzy's Avatar
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Default Wheel Question

I am looking to put the GNX wheels on My 2002 formula. Gbodyparts.com has the wheels. They offer 18x9 and 19x9.5
They offer a set that is two 18x9 for the front and 2 19x9.5s for the back. But that is for the Buick Grand National. Does anyone know if the 19x9.5s will fit under the back of a 4th Gen F body? I'm currently running C5 Vette wheels that are 18xwhatever. I've got 275 35 18s on all 4 corners with zero rubbing anywhere. I have 4 front wheels on my car, so all the tires and wheels are the same size. However, I'm looking to upgrade the backs to 19s.
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Old Nov 1, 2023 | 04:13 PM
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Offset / backspacing is almost certainly different.
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Old Nov 1, 2023 | 07:44 PM
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From: Schiller Park, ILL Member: #317
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I don't think 19s would be an "upgrade" for the rear, 18s squared will probably give you the best balance of all factors/considerations.

Beyond that, as mentioned above, the G-body offset is probably going to be different. Their stock 15x7" wheels had a 3.75" BS if I remember correctly, so to maintain that same general ratio with a 9 or 9.5" wide wheel likely isn't going to be ideal for a 4th gen F-body.

There is only one thing to do: ask the vendor what the offset is. Beyond that, it's all guesswork.
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Old Nov 11, 2023 | 05:35 PM
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The offset's going to be around -12 or -19 for g-bodies. Very far away from what you need for an F-body..
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