Definitely not Columbus air and speedstream was for lugless construction with fully aero tubing. This frame has normal tubes which are flattened in the middle. Rayleigh did this on a few models even low end frames with 501 tubes (Quasar). Likely 531 or similar judging the lugs and shot in seat cluster.
Definitely not Columbus air and speedstream was for lugless construction with fully aero tubing. This frame has normal tubes which are flattened in the middle. Rayleigh did this on a few models even low end frames with 501 tubes (Quasar). Likely 531 or similar judging the lugs and shot in seat cluster.