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265/40/17 means that the width of the tire is 265mm and the sidewall height is 40 percent of the width and it is mounted on a 17 inch tire. Go to tirerack.com to find out specifics like total radius etc. in figuring out what tire will match the ones you are looking.
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by JeffMc
I cannot locate my exact sizes.
The only number that must be exact is the wheel diameter (17" and 18" in your case)... the section width and height can be slightly different and it won't hurt anything.