Metcalfe won the Milk Race in 1964 and, in the same year, had back-to-back stage wins in Canada's classic Tour du St. Laurent.
Two years later he won both the National Roadrace championship and time trialling's Best All-Rounder competition in the same year.
In 1967 and 1968 he rode in the Tour de France and was a one-time winner of the prize for combative riding after one of his signature long, lone breakaways.
After his racing career was over he started a framebuilding business in 1972 with another road star of the day, Wesley Mason.
Metcalfe and Mason - the two M's in MKM - produced their frames from Chapel Works in Harrogate, so named because it was a former chapel. The building was owned by Ron Kitching and the 'K' in MKM stood for 'Kitching'. The business operated until the late 1970s.
Metcalfe remained a roadie and was often to be seen on his bike in the Yorkshire countryside he loved. He was a supporter of Michael Breckon's National Byway.
Funeral details will be posted here in due course.