Conversation Between MrEous and imaking133

yes this is what I was getting at.

You're using the 17" & 18" as the radius...my point was using the wheel & tire combination as the total radius/diameter.

A 235/50-17 will have a longer radius than a 225/35-19. Now factor in a lighter wheel/tire combo on the 19 and you will accomplish a 19" wheel/tire combo with less rotational mass. Right?

You'll also have a better (stiffer) sidewall on 35 series compared to the 50 series. Better handling, but ride comfort will be diminished.