I just got some 18's for my ride, now can i use the 245/45/18 tires with a 1.5 drop in the front and a 1.8 drop in the back? Or is that tire size too big for the 18's and i should go with 240/45/18...

 

Look in the tires forum...they have lots of size answers there. I ride on 225's with a 1.5 inch drop. I heard 235's will fit just fine without rubbing. I'm not quite sure about the 245's. Check the tire forum and see.

 

I think it should fit. I have 235/40/18 on my front with the tein springs. They drop close to 2 inches. No rubbing of any sort. What is your offset on the rims? That will make the difference.