28.6 mm (1.125") External Butted Seat Tubes


Availability: Out of stock

  • • Designed by Columbus
  • • Alloy: Zona 25CroMo4 alloy
  • • Moderate weight and high strength
  • • Perfect solution for off road and training purpose
  • • Good resistance to heating during welding process
  • • Made in Italy

28.6 mm (1.125") External Butted Seat Tubes


Columbus Zona Steel AlloySince 1919, Columbus has been a leader and innovator in producing steel tubing, first for the bicycle industry, later for aviation and Italian racing car and motorcycle chassis. Known for their extensive research in mechanics and metallurgy, frame builders can count on the guaranteed quality and controlled origin of Columbus to build bikes that combine stiffness and strength with increased resistance to deformation and breakage. The selection of tube profiles and alloys allow for customization to meet the needs of any rider, condition, or terrain. Favored by champions and top riders from Gimondi to Merckx, Hinault to Argentin, Lemond and Roche, Columbus is internationally recognized as “The Soul of Cycling.”

Additional Information

Part Number ZON113550
Diameter 28.6 mm
Wall in mm .8\.6\1.2
Center 150
Length 550
Alloy ZONA
Butt 1 245
Taper 1 40
Center 150
Taper 2 40
Butt 2 75