Originally Posted by PatrickGSR94

Shouldn't be. As the tire beads spread farther apart, the height of the curved arc of the tire's cross section would have to get shorter.

Originally Posted by wphamilton

If you think of the tire as part of the distance around the circle (that distance doesn't vary) and the rim as another part of the circle (gets longer with a wider rim) then the whole circle gets larger.

Of course it's not exactly a circle so it varies from tire to tire how much or even if it gets taller.

Originally Posted by Slaninar

Tyre dimensions