Superbe Tech:
Probably Suntour’s most innovative and beautiful derailleur – and the company’s first glorious failure. The 1983 Tech has a completely enclosed linkage instead of the open parallelogram other mechs use. The cable routing was clever too – straight along the chainstay with no loops of cable.
That clever linkage would be the downfall, though – it wore and broke very quickly, and was very difficult to fix – so the Tech only lasted for a year.