Yes they are bigger! I didn't make the opening in the bottom of the wheel pants bigger right away and while hitting some uneven ground bumps, tore some of the side material off the pants. I rebuilt them last winter and made the gap larger, about an inch on the sides and about half an inch on the front and backs. No problem now even with some hard landings.
PS: a good reason to only paint your wheel pants one color, easier to repair!
I love my monster retreads!
Unfortunately in science, what you believe is irrelevant.