Also answered under your post in 'Hot rods'

This should help visualize things for both offset and wheel width effects.

http://toy4two.home.mindspring.com/offset.html

This site does the same thing for tire width and diameters.

http://www.miata.net/garage/tirecalc.html

The tire rack banner in the 'wheels' sub forum also has a good discussion with diagrams and pictures.

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

__________________
John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E