wheel or rim offset is culcalated from the middle of a rim to the flange is located...
how do i explain????
lets do this...
u put the rim on the floor(the inner ring on the ground) get a tape n measure from the middle to the lip.
then measure the lip to the holes(flange) minus the both..
say the middle to lip 38
lip to flange 4.
38-4 u get 34..
thats the rim offset..
still dont understand???