Originally Posted by dark3drcos.kickass
both these sizes are correct as the205/215 is the width not the profile so both have same diameter it depends on wheel width you take standard tyre size and take off 5 on profile for every inch bigger
you forget one thing mate.. 205/215 are in mm(millimeter) and 40 are in % that will say that on a 205mm wide thire, the side are 82mm high:
205x0,40=82mm high tyre sides
215x0,40=86mm high tyre sides.
not mutch i know.
and of course 17 are in inches