245/40 will 100% not fit, rear or front. I have 18x9.5 squared with a +35 offset. having a lower offset, ie. +30 means your wheels will stick out even farther. 225/40s is what i run now and its perfect for my wheels being functionally low. Unless you run mad camber and have LCA's and Endlinks, you wont fit 245/40s on a 9.5 with offset smaller than +35. How do I know? Last season I ran my 18x9.5 +35 wheels with 245/40 falken 453 summer performance tires. I installed bc racing coils and maxed the camber out on the rear and the fender still sat on the tire. The fronts pulled my fenders and rubbed the inner paint fully off. All I can say is that its the only functional way to be slammed in a safe manner is to run a safe mild stretched tire. 225/40/18x9.5 isn't that extreme and is completely safe for daily driving. I know this first hand and I'm not speaking theoretically.
|