First.....
Welcome to the forum..... Tons of great knowledge here.....
Yes.... there are guys running 18" rims and larger even..... it will come down to tire size and wheel offset....
15x7 in front will like at least 4" backspacing and shoot for 4.5" backspacing on the 15x8's in the rear....
I am running 235/60r15's in front and 245/60r15's in rear....
One last thing..... undo the CAPS LOCK button.....
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Troy
Rockaway NJ
67 GTO
400HO / TKX 3.27 1ST GEAR-.72OD / 3.36 POSI
HOTCHKIS/UMI/BILSTEIN 
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