Bob --
First, and again, I don't know shi-t about motorcycles. And I guess it shows.
You've got 5 years on me, but I've been "involved" with SCTA since 1972.
I don't know what happens to "retired" records. Early SCTA car records ran under different classification systems. Were these then retired? I don't know. I'll Goggle old record retirement homes and see what I come up with. I know the current Rule Book doesn't have a "retired" section, but sure has a lot of motorcycle records.
My Roadster has been "safe" one year and then not the next. I've had to update it through the years as the rules changed.
Years back, the SCTA instituted the Classic category for various car records. They did their best in moving current record holders they then believed fit that category into the Classic records. So some cars, including one that I was very little involved with, ended up being the record-holder in a class that they'd never run in.
I've seen a lot of SCTA record-setters in museums. A lot of museums honors vehicles from the past which set records and also may, or may not, be legal to run today. That's what museums are for, I guess.
I agree with you -- I would also like it if Side Cars had passengers. But that is not what the SCTA rules allow. No one forces any one to compete in any event. But if one competes in the event, he should use their rules as competition guidelines. And can join the association or governing body and work to make the rules more to his liking. The SCTA has allowed competitors to do this. Yes, it's arduous, but I'd bet it would be easier to do there than in FIA, Nascar, etc.
I don't have all the answers, but I sure got opinions. Some knowledgable, some not (see above first statement).
Stan