Apart from minor modifications to the mounting points, the chassis, suspension and steering were unaltered.[citation needed] This later version of the Roadster was given the model designation 20TR.[1]
On test the changes resulted in the top speed increasing marginally to 77 mph (124 km/h) but the 0-60 mph time was much better at 27.9 seconds.[citation needed]
The car was never made in large numbers and was mainly hand built. 2501 examples of the 1800[1] and 2000 of the larger-engined version were made.[1][2] Production ended in October 1949.[2]