bruce4469

I am very close to needing to replace the 225/40/18 tires on my 2007 IS250 and want to know if anyone has gone to any type bigger 18 tire? I do not want to change wheels and am only interested in trying to improve the ride for a senior lady. I know for example a 255/40/18 would give more rubber and a better ride, but will it clear everything? None of Wheel dealers or anyone in my area seems to know answer. So please help me!