So tomorrow the car goes for a full respray and it's time to think about tyres. The car came to me from Japan with genuine BBS RGll wheels, fronts are 18x9 et42, rears are 18x10 et50, wheels fit perfectly. However, front tyres are 225/40 and rears are 245/40 both of which are stretched to fit the wheels which won't pass test and I don't want in any case. So how wide can I go without catching the arches and destroying a 3 grand paint job? I'd like 235 front and 265 rear.