I saw them on a tractor when I was shopping for my 3910. Look large, but not out of place. Don't recall the rears in the picture. 600-16 3 rib 6 ply with 13.6x28 (13" rim) came on my 3910 and they fit just right in clearance and front to rear height with said rears.
Get on the www and google the model for sale. May have been in Tractor Shed. Pics are out there.