Ariel's history began in 1870 in Coventry with the production of bicycles, and the company later moved into motorcycles in the early twentieth century. Ariel motorcycles were built in Birmingham and became respected for sound engineering and strong road performance, with the marque passing through several owners over the decades. The firm produced a wide range of singles, twins, and the unusual Square Four before motorcycle production ended in the 1960s.

Ariel is best known for the Square Four, a four-cylinder engine arranged in a square layout that gave smooth, flexible power, and for the Red Hunter single-cylinder models of the 1930s. The company also built the two-stroke Leader and Arrow models in the 1950s, which were advanced and distinctive for their time. Ariel motorcycles have a loyal following among British motorcycle collectors and vintage riders. The Square Four engine went through several displacements during its life, and the model remains one of the most recognizable British motorcycle designs ever produced.

Ariel workshop manuals cover engine overhaul for singles, twins, and the Square Four, carburetion, ignition systems, clutch and gearbox, brakes, and electrical and wiring details. Factory specifications and maintenance procedures are important for restoring these machines and for running them reliably today.

These manuals are mainly of interest to classic motorcycle enthusiasts, specialist restorers, and workshops that care for pre-1960s British motorcycles. Accurate documentation helps preserve Ariel motorcycles, supports correct restoration, and keeps surviving examples roadworthy and safe. Enthusiast clubs and specialist suppliers continue to support these machines, and factory manuals remain a primary reference for correct rebuilds.