The 1985 and 1986 Superbe componets were the best of their era. But, that was the moment in time that Shimano perfected indexed shifting. And, in 1987, Shimano introduced SLR braking. About 1990, Shimano introduced STI. Sun Tour was a tiny, underfunded company that got buried in the tidal wave of new technology.

But, if you like friction shifting, you can't do better than the Superbe. Rivendell has contracted with a supplier to make "new" copies of the shifters that were used with the Superbe changers. The advantage of the Rivendell shifters is that they work well with any of the old gear changers, any freewheel or cassette, five speed, six, seven, eight speed...it works with them all. Add a Sachs/Sedis/SRAM chain (whatever name they are using this week) with the Rivendell shifters and your 1970's or 1980's drivetrain is ready for the road.