IberaBike Carrier Rack, for Heavier Top & Side Storage, for 26"-29" Frames

What is the measure used for 26"-29" "Frame" ? My bike has a 21" seat tube and I am >6 ft.

Is this rack suitable for a bike with 4" wide tires, or is there a model specifically made for one? Thanks

Will this fit on 20 inch (51cm) Trek 7.2 fx hybrid bike?

Will this fit a beach cruiser with 26" wheels and fenders?