See also: BSA documents

Country: UK

The Birmingham Small Arms Company (BSA) was founded in 1861 in Birmingham. It grew into a huge metal-bashing conglomerate, operating many dozens of factories producing hundreds of different types of engineered products.

BSA started producing bicycles as early as 1880 and finally sold its bicycle manufacturing operation to Raleigh in 1957. In a slightly pale imitation of Raleigh, BSA produced some bicycle components, notably three speed hub gears. I am only aware of two models of BSA derailleur, one introduced in 1949, and then a revised version introduced in 1952.