Lets not forget the BSA and Triumph 3 cylinder 750's
Now that you mention it, I recall a fellow I worked with had a Trident.
Quite a beast.
He would blast around on it.
I was too intimidated by it to attempt to ride it, and it was in showroom condition, so I did not want to drop it and scratch it up.
How you get disk brakes on that bike ?
.