didn't stretch onto 7j, always just normal tyres, anything less is as i said pretty rubbish. i once had some 175 65 or 70 off a micra on the 15's and they were so shit. no grip at all.
if you do it on a 9j then fair enough. you can still fit 185/195 tyres on them.
i also refer to this thread and agree with matt entirely.
what tire size rubbing arches
you need wide rims to do it. you also need ideally near to 0 offsets so like a plus 10 etc. otherwise the flip is going to be extreme. either this or mental bodywork to house them.
also to reply to it being no different to a low offset 7j, like matt said when you see loww offset 7j they are like -10 -20 at most. these are like -35 or similar.