1958 BSA Bantam D5
When the decision was made to upgrade the Bantam’s engine capacity, 150cc was decided upon, as it kept it in a cheap tax bracket. To start with there was a plunger frame, but this was swapped for a swinging arm job, the same frame which would go on to be used for the D5. The D3 Major was launched for the 1954 season, with the increase in capacity achieved by a larger bore. The 175cc D5 came in 1958