The Gold Star was not considered for progression to unit-construction, and instead the 250 cc BSA C15 was developed (via the B40) into the 500 cc B50. Although the B50 never attained the kudos of the DBD34, a B50 fielded by Mead & Tomkinson once held the class lap record in the Production TT, as well as gaining results at the 24-hour endurance races the Le Mans Bol d'Or and at the Montjuïc circuit in Barcelona. CCM used BSA B50 bottom ends in their early specials. BSA Gold Stars won the following Isle of Man TT races.