1934: The Reynolds Tube Company introduces the double-butted tube-set 531 for high strength but lightweight bicycle frames. Reynolds 531 remains for many years at the forefront of alloy steel tubing technology and is used to form the front subframes on the Jaguar E-Type during the 1960s. Before the introduction of more exotic materials such as aluminium, titanium or composites, Reynolds is considered the dominant maker of high end materials for bicycle frames. According to the company, 27 winners of the Tour de France have won riding on Reynolds tubing.