Note that since there are several popular methods for measuring frames, this number may not agree with the frame size as declared by the manufacturer. A larger number is more flexible, and a smaller number is stiffer. A larger number is more flexible, and a smaller number is stiffer. 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.