Reynolds 531 AK73-77

46x37mm

This was the alternative to Ref “J” and seems to have been used because Columbus moaned that the previous version implied that the forks and stays were butted too – which they weren’t. It forms part of the 73-77 series but we doubt that it was introduced very early on in that period.

NOTE this is the FIRST time that the “531” moved from the diagonal for double butted frames.