Originally posted by SonOfABoss:
FWIW 215 is not the widest part of the tire. It is the width of the tread from inside to outside of the tread only, that does not include the side wall of the tire, just the tread.
Actually, both are wrong. The 205 or 215 is the section width, which is the measure of the width of the tire from sidewall to sidewall at the widest part. If you have raised letters, they are not considered part of the section width
Peep here:
http://www.tirerack.com/tires/tiretech/general/size.htm TB
