The National Cyclists' Union (NCU) was an association established in the Guildhall Tavern, London, on 16 February 1878 as the Bicycle Union. Its purpose was to defend cyclists and to organise and regulate bicycle racing in Great Britain. It merged with the Tricycle Association in 1882 and was renamed the National Cyclists' Union in 1883. The National Cyclists' Union selected teams for world championships and regulated circuit and track racing in England and Wales. It was a founder member of the International Cycling Association, forerunner of the Union Cycliste Internationale, the world governing body. During and after the Second World War, the NCU became involved in a civil war with a rival body, the British League of Racing Cyclists, which defied the NCU's rules that massed-start races should be held on public roads only when they were closed to other traffic. The struggle between the two lasted for a decade, after which they merged to become the British Cycling Federation. (en)