[1] Although every bike was designed to meet specific customer requirements—even the handlebars were individually shaped[2]—sixty-nine SS100s were produced in 1925 and at £170 (equivalent to £12,200 in 2023) were advertised by Brough as the "Rolls-Royce of Motorcycles".

Every owner was encouraged by Brough to suggest their own ideas for developing the SS100, which meant that almost all his motorcycles were uniquely hand-built and the design continually evolving.

[6] The Sturmey-Archer gearbox was upgraded in 1929 for a three speed "super heavyweight" box to cope better with the 50 bhp (37 kW) produced by the JA Prestwich Industries (JAP) engine.

[better source needed][3] In 1928 Brough introduced rear suspension and in 1934 the Alpine Grand Sports gained a 75 hp (56 kW) overhead valve JAP engine known as two of everything as it had two magnetos and two oil pumps.

[better source needed][11] He was not wearing a helmet and suffered serious head injuries that left him in a coma; he died after six days in hospital.

He consequently began a long study of what he saw as the unnecessary loss of life by motorcycle dispatch riders through head injuries and his research led to the use of crash helmets by both military and civilian motorcyclists.

[17] The chassis is an expensive mix of magnesium, titanium, and aluminium with carbon-fiber wheels and a double-wishbone front fork.