yeah and while your at it call sears and tell them that thy're managers don't know how to train there associates cause that's what the fuck i am. i know my tires ass. first of all a 235 40 17 will not fit on our cars without rubbing that's why the guys on 19's have to roll 225 35's. you'll never fit more than an 8 inch wide rim under our car. therefore your spreadsheet is for shit cause it is explaining how to upsize tires and not how to upsize tires on the rim in question :wary