Howdy, Greg. Welcome to the list.
Regarding your 1983 question; the list-keeper bumps the limit every year to keep it 20 years back, but there were some interesting forces at that time:
--The Vitus 979, introduced in 1979, was gaining prominence to become the first aluminum bike accepted in large numbers into the peleoton;
--Assos introduced lycra in 1979, and by the early eighties it was everywhere;
--Shimano's "New DuraAce" was introduced in 1985, if memory serves, ending the Campy NR/SR reign and popularlizing indexed shifting;
--Aero brake levers were popularized by Alexi Grewal in 1984; in fact, a whole aero mini-revolution occurred around then;
--Time trial "funny bikes" and "cowhorn bars", corallaries of the aero fad, are introduced;
--Alexi's bike also popularized the "fade" paint job, which one could fairly consider the bicycle mullet;
--Look's Clipless pedals were introduced in 1985;
--Mountain bikes were ascendent, bringing with them tig welding, "oversize" everything, and a downhome-punk aesthetic;
--Specialized introduced the Turbo line of tires, and Mavic the GP4 high-performance clincher rim, offering an alternative to sewups.
These aren't all bad trends, but did in aggregate spell the end of one era and the beginning of another.