Ditto…all of the wheel/tire recommendation listed in your owners manual all have the same rolling diameter/circumference. If you don’t believe us…just google for a wheel/tire calculator and compare the 19”/20”/21” tires and you’ll see how close in spec they are:
- 245/45/19
- 245/40/20
- 245/35/21
Another term you can google to get an understanding is “plus sizing”. As the wheel size increases, you decrease the aspect ratio of the tire…which will maintain the same rolling circumference.