Hello,
I have a 2017 Convertible Mustang Ecoboost Premium with the OEM 20" rims. Wheels size 20" X 9", bolt pattern 5 X 4.5, offset 42.5MM for all four wheels. I have 265/35/20 in the front. And I upgraded the rear tires to 295/40/20. and they fit perfectly and still have a lot of space (like 4"...