Okay... haven't tried any of my 40"+ rounds on this little splitter yet, but here's one around 24" x 30" oval with two piths, from just below a crotch, I guess. It stalled the splitter going vertical, and I had some real fun getting the wedge in-stuck, so I decided to try it sideways. It just barely fit: That was the ticket! Made a fair amount of wood from one medium round. I guess I'll be noodling the 49" oak rounds! Splitter is 22-ton Huskee from TSC.