I have 8.5j width 19's on the back with 5mm spacers and running pretty low on coilovers, never had any rubbing same with my oem LCR alloys and 15mm spacers.
 
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7.5J with 15mm are very very close at the back..

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how lows that? how do you get on over humps and bumps?

not sure how low, can just get a finger between wheel and arch all round. Don't have many issues with humps and bumps, have to take larger ones at 45 degrees but normally fine.