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Selecta ®
From WikiPedalia
Selecta was an early Shimano ® attempt at a splined crank/bottom bracket system, dating from the late '70s or early '80s.
The spline pattern was chosen to permit the spindle to fit through a Front-Freewheel bearing set, because a standard-sized square-tapered bottom bracket spindle would not fit.
This design turned out to be rather unreliable, due to the small diameter of the splines, and Shimano abandoned the system. Shimano did continue to supply spare parts for many years thereafter, but these are no longer available.
