Writer of the Sherlock Holmes mysteries, Dr. Conan Doyle (1859–1930) on a tandem with his wife. Original Artist: By Elliott & Fry. (Photo by Hulton Archive/Getty Images). Circa 1895

A German invention to fill a barrage balloon by generating power using a converted tandem bicycle. (Photo by Hulton Archive/Getty Images). Circa 1914

Eric Linden and Eddie Nugent on a tandem in “Ah, Wilderness!”, a comedy by Eugene O'Neill. It was directed by Clarence Brown for MGM. (Photo by Hulton Archive/Getty Images). 1935

A pair of cycling enthusiasts riding a tandem along English roads. (Photo by Felix Man/Picture Post/Getty Images). 10th June 1939

British actress Renee Houston (1902–1980) cycles to work at Denham Studios on a tandem with her actor husband Patrick Aherne (1901–1970), 7th March 1940. (Photo by Parker/Fox Photos/Hulton Archive/Getty Images)

Holbein and his great rival Sharland riding a tricycle tandem. (Photo by Hulton Archive/Getty Images). Circa 1918

A new type of tandem at Alexandra Palace, London. (Photo by Fox Photos/Getty Images). June 1936

The Saunders family of Kent, prepare to go for a ride on their unusual cycle, which is 12 feet long, has three seats with pedals and a sidecar at the back. (Photo by Fox Photos/Getty Images). 19th January 1937

Miss Bland and Mrs Bland of Morden, Greater London, riding a tandem wearing shorts and headscarves. (Photo by London Express/Getty Images). 1938

An inventive cyclist joins two bicycles together after an accident, and rides home with his spare wheel attached, over Blackfriars Bridge, London. (Photo by George W. Hales/Fox Photos/Getty Images). 3rd August 1939

American servicemen on a five seater cycle. (Photo by Maeers/Fox Photos/Getty Images). 19th May 1944

Members of a cycling club take their family with them on a day out, using a three-person tandem and sidecar, June 1948. (Photo by Haywood Magee/Picture Post/Getty Images)

Members of a cycle club, riding on two tandems and a bicycle during a club tour. (Photo by Haywood Magee/Picture Post/Getty Images). 19th June 1948

Mr and Mrs Leonard Howe of Streatham, London, riding their tandem with an additional section attached at the back to transport their two children. (Photo by Fox Photos/Getty Images). 1952

A family riding on a bicycle made for four. (Photo by Fox Photos/Getty Images). 1953

Two bicycles that have been specially converted by a manufacturer in Brunswick, Germany, into a 'tandem' that is big enough to transport a family of three, and carry enough equipment for a weekend's camping. (Photo by Hans Meyer/BIPs/Getty Images). 1955

Five people riding an 1897 Dunlop Racing Quintuplet bicycle in a bid to beat Britain's national railway strike. (Photo by Fred Ramage/Fox Photos/Getty Images). 4th June 1955

Cycling to the church, fashion models, Lawrence Candley, Virginia Northrop, Jean Ollis and Nicky Hunt. (Photo by George W. Hales/Fox Photos/Getty Images). 6th April 1966

A couple riding a tandem along an American street on a summer's day. (Photo by Orlando /Three Lions/Getty Images). Circa 1955

A couple enjoy a ride on a tandem cycle in the park. (Photo by Evening Standard/Getty Images). 15th February 1974

Linda Johnson and Vic Orton on a back-to-back tandem. (Photo by Evening Standard/Getty Images). 25th March 1980