I was randomly searching on google for some SunTour derailleur parts for my bike and ran into this website. It’s pretty helpful because it’s a large database with a giant list of bike parts with pictures that verify each and every one of them, including its specs. After searching my SunTour Cyclone derailleur, I guess I have the SunTour Cyclone 2nd generation derailleur, the one before the Mark II.

Pretty helpful, I’d say. I’m definitely going to use this if I plan on finding some more vintage bike parts or just plain identifying each part on any vintage bike.

Here’s the website: http://velobase.com and the page I found about the front derailleur (here’s the main page with the list of parts).