There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
Some time ago, with what he had to work with, Tigerluver came up with this comparison: Size Comparisons page #8 - post #107.
Ursus ingressus - Sh. Height: 170 cm ( 5 feet 7 inches ). Weight: 740 kg ( 1,631 pounds ).
Ursus maritimus tyrannus - Sh. Height: 170 cm ( 5 feet 7 inches ). Weight: 700 kg ( 1,543 pounds ).
I have the strong feeling that, just as with Arctodus simus and Arctotherium angustodens, these two will be close enough in size so that which is the largest will be debatable.