as some A and F family hubs. A 1936 TC hub would, for example, be marked TC6, TC 6 or TC-6. 'A' and 'F' family hub gears Sturmey-Archer's most widely known product is the AW wide-ratio three-speed hub gear, introduced in 1938 (though patented in 1936) and still in production in a substantially modified form as of 2018. It is the sole survivor of a much larger range of "A" model three-speed hubs, including the AG Dynohub, AB 90mm drum brake hub, AM (medium ratio for "club" riders), the AC and AR (close ratio racing hubs for time trialists) and the ASC (a unique three-speed fixed gear). In 1939 a four-speed close ratio model AF was released, intended as a close ratio 3 speed with an additional low gear for hills, this was discontinued in 1941 and succeeded by the near identical FC hub in 1947. 1939 also saw the introduction of the FM four speed medium ratio hub, which was mechanically very similar to the AF and FC. Post-war, in 1946, the FW four speed wide ratio hub was introduced and spawned the FG Dynohub and FB 90mm drum brake hub. the FG would come to characterise the output of the heyday of Raleigh Superbe model bicycles, while the relative longevity of the FW can be largely attributed to its deployment on high end Moulton Bicycles through the 1960s until its discontinuation in 1970. The FW led to the development of a series of internally similar 'S5' five-speed models, and by 1994, Sturmey-Archer were producing seven-speed hubs. Production was low, and in the mid-2000s these were discontinued, hub geared bicycles having gone mostly out of fashion. SW hub gears The brief story of the Sturmey-Archer SW series medium-flange wide-ratio three-speed hub provides strong substantiation of the merits of the AW design. Sturmey-Archer Gears Ltd. designed the type SW Mk. 1 medium-flange wide-ratio three-speed hub in 1954 and began production by 1955, intending it to replace the AW series of large-flange hubs which were intended for discontinuation upon the SW's introduction (AW hubs were still being produced in 1956, and may have continued throughout the SW's run, despite being absent from catalogues). Compared to the AW's 25% reduction in first gear, direct-drive second gear, and 33.33% overdrive 3rd gear, the SW offered slightly wider gearing, referred to by Brian Hayes as "super-wide" gearing, with 27.7% reduction for first gear, direct-drive