Well, if it is a 245/45 17, the diameter is 25.68"
Original should have been a 205/65 15 which is 25.49" diameter.
For anyone who wants to know how to figure tire diameters.
eg. 245/45 17
245/25.4, this gives you the width of the tire. (245 is in millimeters, why, who knows)
take...