I posted this yesterday on .net:
Here is what I found for a working example
The front are 18x8.5 et30 rears 18x10 et25....which turns out to be +30 front and +25 rear
Reference for explanation about ET:
Wheel Offset |
Originally Posted by above link Another important thing is the wheel offset, which is the distance between the middle line of the centre of the wheel width and the mounting surface of where the wheel bolts to the hub on the vehicle. The offset is described by the term ET, which is from the German word 'Einpresstiefe' translated as 'insertion depth'. Most wheels have a positive offset which means the mounting surface is further outboard than the wheels centre. If you reduce the amount of positive ET on the wheel the the vehicles track is widened and vice versa if the ET number is reduced. Straying too far from the original offset can be detrimental as fouling to the suspension and bodywork can occur as well as excess strain on wheel bolts or studs |