I ran 235 Scud width front tyres on the smaller width standard size Scud look-a-like wheels for 2 years, no issues it worked fine, didn't see any benefit for road use so went back to 225 recently when I switched to Michelin Pilot Sport 4S
I indeed have a F430 with Carbon brakes and a non standard Geo but felt no advantage over 225's, in fact my GT3 RS on 265 fronts goes round corners like it is on rails but wonder if it would be more fun on the road on something narrower