The Kirby BSA sidecar outfit was custom-built as a racing sidecar oufit, specifically designed and developed to compete in the F.I.M. Sidecar World Championship between 1965 and 1973, and built between 1965 and 1966. It was powered by a engine from the BSA Spitfire.
The driver, Terry Vinicombe, and passenger John Flaxman were sponsored by Hornchurch, Essex-based motorcycle dealer and farmer Tom Kirby, who also ran a stable of solo racing motorcycles and had promoted Alf Hagon and eventual world champions Mike Hailwood, Phil Read, and Bill Ivy. 
The outfit won the large-capacity sidecar event at the 1968 Isle of Man TT races. 
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