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I use this http://www.carbibles.com/tyre_bible_pg4.html to calculate the difference @ 70mphscroll down and you can put in before and after wheel/tyre size (Y)
I use this http://www.carbibles.com/tyre_bible_pg4.html to calculate the difference @ 70mph
scroll down and you can put in before and after wheel/tyre size (Y)
