Rickman Motorcycles was a British, independent motorcycle chassis constructor established by brothers Derek and Don Rickman. The firm manufactured motorcycles from through . History Initially the frame designs were for scrambles, and then for road racing. Later, in 1966, road bikes were produced as well. The first street legal bike used a Triumph Bonneville engine. Rickman initially supplied frame kits to the public, as no major British motorcycle manufacturers would sell engines separately. The frame kits were built for many engines, including Triumph twins, BSA singles and Matchless. In the mid-1960s, Rickman also produced road-racing frames for AJS 7R singles, and in the 1970s they began selling chassis kits for Japanese bikes like the Honda CB750 and Kawasaki Z1. The road bikes were the first to use disc brakes both front and rear (a joint project with Lockheed). Other innovations included the use of large diameter telescopic forks (1-5/8" or 41.2mm) and oil carried in the frame tubes to help dissipate heat and save weight. An eight valve cylinder head conversion (700cc) for Triumph 650cc twins was developed in the late 1960s which considerably increased power output (up to 60 bhp or more depending on state of tune) and showed up some weaknesses in the Triumph crankcases and connecting rods. Chain adjustment was via eccentric discs rather than drawbolts to avoid misalignment. After the Royal Enfield factory closed, a little over 200 Series II Interceptor engines were stranded at the dock in 1970, originally on their way to Floyd Clymer (of Clymer repair manuals and Enfield "Indians" fame) in the United States, but unfortunately he had just died, and his export agents, Mitchell's of Birmingham, were left to dispose of them. They approached the Rickman brothers for frames, and as the Rickman brothers' main problem had always been engine supply, a limited run of 137 Rickman Interceptors were built. In about 1971, Rickman began producing complete motorcycles in 3 displacements, 100 cc 125 cc and 250 cc. The 100s had Japanese Hodaka engines, the 125s had German Zundapp engines, while the 250s featured Spanish Montesa powerplants. Many of these little Motocross bikes were produced from 1971 to 1975, most being shipped to America. In 1974, Rickman was awarded the Queen's Award to Industry for their export business which achieved £1 million sales to the US each year, but it was the same year Norton Villiers Triumph collapsed. The Rickman brothers