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Superset
From WikiPedalia
A Bianchi trademark. In the 1980s, Bianchi used a "Superset" design, where the down tube and chainstays were supposed to be a bit heavier-gauge than normal, and the upper parts of the frame a bit lighter. The idea was to stiffen up the drivetrain. This was based on standard diameter round tubing, to fit standard lugs.
The later (1990s) "Superset II" design required special lugs, because it used an oversized down tube, ovalized at the bottom, also oversized oval chainstays. Bianchi was unique in using oversized and ovalized tubing with lugged construction, because the tooling for the special lugs was quite expensive.
