Dunlop's signature quality, crossply tire of the 1930s, the F4 was the fitment of choice for the most luxurious cars of the era. As such, it remained in production for the vintage car market until Fort Dunlop's final closure in the 21st century! Its sculpted side and shoulder are extremely recognizable and a symbol of quality. Ensign developed an F4 replacement tire through its historic relationship with Dunlop, and using original molds. The result is manufactured in the UK as the Ensign F4 and comes in various sizes to suit 17-21 inch wheels. This Ensign F4 tire in size 600-21 is the ideal tire for: the Hispano Suiza H6 and 37.2; Delahaye 112; Daracq DUS and TL; Daimler 20/70, 25/85 and Double-Six 30; Hudson Super Six, Hupmobile E; Sunbeam Straight Eight, 20/60, 25 and 30. This is a cross-ply tube tire.