34.9 mm (1.375") Single Butted Seat Tubes - SEAT POST DIAMETER = 33.1 mm


Availability: Out of stock

  • • Designed by Columbus
  • • Alloy: Life Niobium Steel
  • • Exceptional mechanical characteristics
  • • High breaking load, superior tenacity and incredible fatigue endurance
  • • Excellent resistance/weight ratio
  • • Made in Italy

34.9 mm (1.375") Single Butted Seat Tubes - SEAT POST DIAMETER = 33.1 mm


Columbus Life Niobium 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 SLFL13635
Diameter 34.9 mm
Wall in mm .7\.5
Center 460
Length 635
Alloy LIFE
Butt 1 135
Taper 1 40
Center 460
Taper 2 -
Butt 2 -