Se 72bluNblu comment... July 16, 2016:
"...I run 275/40/17's on the front of my Challenger with 17x9's and a 5" backspace. They're a little shorter at 25.7", and require a 9" wide rim..."
Since the Year One rims are CORRECTLY offset, at both 8" and 9" widths, there's no reason why a 275-40-17 tire mounted on a 17x9 rim with the correct offset/backspaing shouldn't work. The tire is relatively small in its diameter.
My car is lowered f/r using 16x10 rims with zero offset (5"backspacing), which pushes the tire/rim outwards ~1/2 inch from the preferred correct positioning.... using 275-45-16 Hoosier A6 DOT Autocross tires... flushed the lips, pulled out a little, appears stock... IF the rim's offset was correct at 5.5 ", then I'd probably NOT have had to make those mods (again, car s lowered for autocross competition).
I suggest you re-confirm with our comrad 72bluNblu here as he has a Challenger and ruins 17x9 275-40-17 both front and rear.... I'd run them easily on my car, even without any lowering or slight fender mods... I'd be 100% certain they'd fit A-OK.