Oh Gosh, shucks, phooey,D@mn! You be correctamundo.
Overnight their web site has changed!
I have just researched and the Bridgestone web site for motorcycle tires no longer even lists the 50 aspect ratio!!!
Now I AM worried about being able to find the multiple 240/50R16 rear tires I will need on my 10 - 11 K mile ride across the US & back this June.
Time to research other brands size and aspect ratios that might produce a similar trail to what I have now.