A larger number is more flexible, and a smaller number is stiffer. A larger number is more flexible, and a smaller number is stiffer. Three main tubes are 31.8 x 0.5 mm. Stays are 19.1 x 0.5 mm. All tubes are AerMet except CrMo head tube.
Numbers given are the diameter in millimeters of the top, seat and down tubes, respectively.
34.9 mm diameter main tubes. Columbus Air is narrow streamline steel tubing. This frame is made with lugs which match the shape of the tubing. Chain stays are made from fork blade tubes. Custom made for Ken Carpenter.