The SunTour slant planograph, almost universally copied by competitors when its patent expired, was as fundamental a breakthrough as the 1951 Campag. Gran Sport parallelogram. SunTour Cyclones and Superbes are some of the finest rear derailleurs ever made. I tolerate the original Campag. Nuovo Record on the Bianchi to keep it authentic and because it looks so good, but even my lowly old SunTour V-Luxe, which I used for several years on the Capo, shifts better. Both Peugeots have SunTour Cyclone rear derailleurs, which represent huge improvements over their respective generations of Simplex.