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Reply to "Larger diameter wheels. Upgrading wheels and tires. Resizing wheels and tires. Modernizing wheels and tires. Campy clones, etc."

You need a 13.0 - 14.0 inch wide rim to fill original fiberglass GP IV flares depending on the backspacing you select.  The 335 17 is narrow in width compared to the 345/35/15 I run.  Measure multiple times and cut once to get the right look.   I have seen 335 tires on too narrow a rim with literally no back space attempting to fill the flare.  Remember the factory GP IV cars use a 14” rim.  

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