thinking of fitting 275/40/18s on the rear of my xk8,would there be eny issues here or would this be fine,dont want them sticking out past the wheel arch lol ,I have 255/40/18 rear and front at the moment but would like to stick with the fronts as thay are,thanks guys.p.s fitting to the impella 18" wheels

 

That tire size will fit. This is a link to a thread with same tire size
https://www.jaguarforums.com/forum/x...40-r18s-96411/

 

thanks mate