Would 255/40/19 tyres fit fine on both 19" 8.5J fronts and 19" 9.5 rears without affecting the handling? They are winter tyres and will be going on a Jaguar XF SV8
A square setup is generally better than staggered when it comes to winter fitments. The wheel rims will accomodate that tyre size comfortably so go for it.
