smallest 20 inch tire

so with the 20x 7.5 wheel the 225/30/20s are gona be smaller in diamter then a 8 1/2 inch wheel? iam ordering 20s monday ill post pic when i get them on

this may help too!http://www.miata.net/garage/tirecalc.html

i have 225 30 r20 on my scion xb they are 25 inchs tall they are nitto tires

come on! they make a 25 series that is 24.82...dont know the width but...there ya go...