I know 11's are no problem. Here is an 11 x 18 Moda Wheel on 78 (same hub) with at least an inch to spare (taken this weekend). Those early rears are tucked in. 
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Michael, So Cal
1985 Porsche 928, Black, 5 Speed
1985 Porsche 928, Weissgold Metallic, 5 Speed
1980 Porsche 928, Black on Black, 5 Speed
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