Sorry but ive heard alot about having hub centric rims or not

and i want to know what are the advantages of both non hub centric and hub centric

I kno bmws are hubcentric (i think)

i just want some clarification because im a little confused thanks :buttrock

Basically, hubcentric wheels will match up to the hub on your car and center the wheel. Non-hubcentric wheels use the lugs/bolts to center the wheel which might not be perfect.

See:

http://www.tirerack.com/wheels/tech/techpage.jsp?techid=91