What does Offset mean?
 

I don't understand what the offset means.

It is basically how "offset" or shifted the centerline of the wheel width is from the mounting hub. It is measured in millimeters. Refer here:

http://www.tirerack.com/wheels/tech/offset.htm

Results 1 - 10 of about 438,000 for wheel offset. (0.31 seconds)

:banghead:

so what tires would fit on 17x7s and 17x8s? Thanks for the help.