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Rim Offset:

Offset if the distance from the mounting surface of the back pad to dead center of the rim, it is positive of center or negative of center...

Positive offset is used for front driving cars
negative offset is used for rear driving cars

When you run wider rims you need to go for a lower offset i think it is, in order to allow the wheel to run smoothly without rubbing on any suspension parts.
The whole purpose of wheel offset is to allow the wheels to balance over the wheel hub in order to provide the most responsive steering,

offset is not standard on whatever size rim you buy, you also need to take into consideration the width of the rim

Here is another picture to help make things more clear
sti_offsets.jpg

higher offsets are generally found on super responsive cars, and also on vehicles with big brake kits, lower offset contribute to a very wide turning radius, and generally not good for your car unless it was designed to run that offset, the end result of running very low offset is prematurely worn
wheel bearings

غالبا اختيار offset غير مناسب هو سبب احتكاك الجنط باجزاء العفشة و عدم ثبات السيارة و الغربله و اختلاف نصف قطر الدوران

انا اعرف ازاى اختار كاوتش مناسب
لكنما اعرفش ازاى احسب ال offset المطلوب فى الجنط الجديد وخصوصا لو هزود العرض بتاع الجنط ............. وكمان ازاى نعرف offset الجنط الاصلى و الجديد

ياريت حد خبره فى الحكايه دى يفيدنا