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I found a wheel/tire fit calculator. I am looking for the best width (I am steering towards a 9.5") and offset to accomodate my new 275/35/18 tires for the rear.
Here is the website:
Custom wheel and tire packages for your ride

2004 GTO 6 speed.
just did new AZA Z08s. 18x 8.5 front and 18 x 9.5 rear with 285-35-18 rear tires

2005 YJ A/4 18 in wheels. 1 of 35
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