 Vincent campaigned the early BSA A7 500  cc pre-unit construction engined sidecar outfits and then later the unit-construction A50 engines when these became available after 1962.During the 1960s some sidecar races particularly those carrying World Championship status including the TT were restricted to 500  cc, whereas the UK national series races had classes where 650  cc (BSA A65 in Chris' case) and larger engines were used.He is associated with popularising the true 'kneeler' concept, and although this was earlier attributed to Eric Oliver who used a "semi-kneeler" in the 1950s, Chris' own frame designs enabled a sidecar outfit with a much lower frontal area and smaller proportions hence better streamlining and lower centre of gravity which is fundamental for high-speed cornering.