By 1924, Bentley decided to build a larger chassis than the 3 Litre, with a smoother, more powerful engine. The new chassis would be more suitable for the large, heavy bodies that many of his customers were then putting on his sports car chassis, and the resulting car would be more refined and better suited for comfortable general motoring. The regular Bentley 6½ Litre and the high-performance Bentley Speed Six were sports luxury cars, built from 1926 to 1930. The Speed Six, introduced in 1928, would become the most successful racing Bentley. 544 were produced.