Originally Posted by fighing2succeed
I'm pretty sure that Ian said that he ran the 225/45 Hoosiers.
That is bewildering. I can't imagine why anybody would run the 225/45/17 on an HS SVTF. Seems pretty clear to me that is is the worst choice of the three sizes. Maybe they were on sale?
Size Price Tread TR Diam Calc Diam
225/40ZR17 $257 8.9" 23.8" 24.09"
225/45ZR17 $257 8.8" 24.7" 24.97"
245/40ZR17 $266 9.3" 24.5" 24.72"
Edit: The diameters listed on TR for these Hoosiers do not match the calculated diameters for the printed size. I added a column to the above table to show the differences. This sort of thing is common with racing tires; even street-class autocross tires are often wider and shorter than their calculated sizes. For example, the calculated diameter for a standard 215/45/17 is 24.62", which coincidentally rounds to the same 24.7" that TR lists for the 225/45/17 Hoosier A6.