I see the word Bevel a good bit... ?
"Bevel" as in bevel gear driven cams. You can kind of see them here;
A better shot of the cam drive
and the "timing chest". 5 bevel gears here, 4 more to turn the cams... though the term refers to singles too, and they have fewer gears. (Obviously the first pics are of the teardown, and this is of the rebuild!)
No "offense" taken in neglecting the pre-91 bikes, I just thought the answers were at best incomplete. While I wasn't completely serious about the pre-916 comment, there is some truth to it. This thread seemed to be drifting that direction and anyone who asks about a superbike vs supersport should hear the whole story.
And for whatever it's worth, I've got a '97 900ss/sp as my main ride, it's the second mid 90s 900ss I've owned. I like them a lot. I've also got a bevel twin (1974 750 GT) and a Superbike (996) so I'm not playing favorites here.
EDIT: Ok, so while walking the dogs (and yes, the one in my avatar shot is named Desmo) I figured I should have added to the posts instead of disagreeing with them, so...
Go back to 1972. After decades of building single cylinder bikes, Ducati debuts the 750cc twin. It wins in it's first outing, at Imola, ridden by Paul Smart. (Flash forward to the Paul Smart Edition Sport Classic...). This bike creates quite a stir as you might imagine.
The production twins consist of the 750 GT, and then the 750 Sport. The GT is what we'd consider a "standard" today, while the Sport had rearsets, clip ons , and a little hotter engine than the GT. Neither one of them uses a desmo valvetrain. (Ducati was still building non-desmo bikes up until... 1980?)
1974. The GT and Sport are joined by... wait for it... the Super Sport. The Super Sport had desmo heads, huge carbs (40mm vs the Sport's 32) triple disk brakes, and was painted up to resemble the Imola winning bike. The fiberglass gas tank even has an unpainted stripe up the middle so you can see how much gas is in it. (Flash forward to the gold stripe on the tank of the 1098 Tri color...) These days the '74 750SS referred to as a "greenframe" and a nice example can cost upwards of 100k.
In '75 the engine design changed a little, including being enlarged to 860cc (Hmm... racebikes were running 860cc before this... sound familiar?). The Super Sport designation remained, signifying the top end bike of the sporting line. In '75 there was still a 750 Super Sport, along with a 900SS. Limited production, very special, unlike anything the Japanese were offering at that point. The 900SS continued into the 80s when finally the Mike Hailwood Replica become the flagship.
Enter belt driven cams and tough times for Ducati. The Super Sport line went away for a while.
Around 1990 there is another 900ss but not many were made. I don't think I've ever seen one in the flesh... and a 750 Sport which is similar to the F1, perhaps a cross between the F1 and the Paso? (F1 fans are likely forming the lynch mob now...)
Cagiva owns Ducati and sets them back on their feet. (The cynics/purists say the F1 is the last "true" Ducati.) In 1991 Ducati puts the 4-valve, fuel injected, water-cooled 851 into production (yes, examples existed before then but let's keep it simple here) along with the 907ie, a fuel injected, water-cooled version of the Paso - more or less a Sport Touring bike of the time. Then a few months later comes the 900 Super Sport. Two valves, air cooled, carb'd - a simple sporting bike. Ducati is getting noticed again (but having bought a 907 back in '91 I can tell you a LOT of people thought they had gone out of business). Superbike racing is getting big, the Japanese have been building fully faired sportbikes for a few years. "Everyone" knows what a Superbike is - and Ducati is doing very well in the series with their version.
(Then in 1992 Ducati sells the Super Light here in the US and I stand in the dealership dumbfounded, staring at it, wondering how I can afford payments on both it and my 907... but I digress)
Then... what was it, late 1994? spring of 1995? The 916 comes out. Ducati's popularity skyrockets. The Super Sport is now known as a yestertech bike for, well, I don't know who people thought it was for. But I'd be willing to say that within a few years, very few people, even those who were infatuated by the 916/996/998 could tell you the Super Sport wasn't always the low-tech throwback, akin to Harley's Sportster. Old technology, underpowered, overpriced, yadda yadda yadda. I bought a 900ss in 1995. We all heard it
The Sportster was a kick ass bike when it came out. People have forgotten that (including Harley). The Super Sport was kick ass when it came out too. Let's not forget that when newbies ask "why the two designations?"
FWIW - I couldn't tell you a thing about the SS after 1998... For various reasons I lost all interest in bikes right around then. But it's back now. ;-)