From the outset they became identified with one particular design of motorcycle which had a large sloping 40-degree single cylinder engine as stressed front frame member. This design spanned the entire history of the company, starting with a 500 cc model and ending with a 645 cc model. The sloping stressed member concept was patented in 1900 by Joah Carver Phelon and his nephew Harry Rayner.
Phelon & Rayner made the first chain-driven motorcycle in 1900.they could not afford to put their first bike into production, so sold the design to Humber for royalties, and that design was produced by Humber till 1907. After Harry Rayner died in a car accident, Joah Phelon went into partnership with Richard Moore.
Phelon & Moore established 1904
Perfection all the way with a clutch and two speed chain drive was standard on a P&M in 1906. P&M motorcycles competed in the first International Six Days Trial (ISDT) in 1913. ( Now called the International Six Days Enduro). The Royal Flying Corp used P&M motorcycles in World War I, keeping P&M busy throughout the conflict.
The P&M Panther was introduced in 1924.
P&M�s big four stroke sidecar bikes were called the Heavyweights, and smaller solo machines were called Lightweights. There were also two and four stroke
Lightweights.