Joined: Jan 2008
Posts: 23,642
Likes: 1,106
From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
Unless you are extremely resourceful, switching a non-STI bike to STI can be quite expensive, and its easy to exceed the cost of just picking up a nice used bike with STI already.
I've never gotten a Cyclone FD to index a triple STI. May be my lack of skill. Last time I tried it, I finally gave up and switched to a Shimano RX100, which worked immediately.
I've upgraded several vintage bikes to STI, but in each case, the project started with finding a smokin hot deal on an STI donor bike.