Steveo,
Are u running 18's as yours is an HSE, so originally u would of had 19"s.
You keep saying u are running 255/55's. (255/55/19-Originally)
Just want to double check as General make the tyres for both the Sport & D3 in 18".
Sport is 255/55/18
D3 is 255/60/18 which is slightly higher...
...i did say slightly..
If u are running 255/55's (18)then they are the wrong size! for the D3...