Hey there boss like I said Iam new to these import cars now nothing about them,now nothing about offset.they are TSW Cadwell rims picking them up from a custom wheel shop they say they will fit no problem and guarantee the fit. They tell me I can fit 235 40 on the rear but I would like to go to the 18 by 9.5 rim in the rear wiyh a wider tire if possible.Like I say I have now idea about the offset though