By your numbers there, he isn't going a size wider, he's just changing the aspect ratio. The aspect radio is basically the height of the sidewall. By going with a 60 AR over a 65, he is shortening the height of the side wall.
If he wants to go wider, the first number would have to change. 205 is the next size up. 10 more mm shouldn't cause any rubbing issue.
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1992 Camaro RS 305 TBI,- Off the road, awaiting rebuild
2004 GMC Sierra- Current Daily Driver.
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