HELP!! i'm tire stupid will this fit?

Nope not enough leverage in the world will get that tire on that rim.. with the 18 in rim your running you're gonna be looking at about a 265/40 R18 size, but don't quote me on that, because I'd need the rim width and fender clearance to be exact on the right size...but if you have the wheels already just order the same tire size you already have, if you're upgrading to the 18 in wheel, the company you order them from will be able to tell you exactly what tire size you'll need to fit correctly on the wheel.