The Dundrod Circuit, (Irish: Dún dTrod) first used in 1950 for the RAC Tourist Trophy automobile race was 7.416 miles (11.934 km) in length in Co Antrim and later amended for the 1965 racing season to 7.401 miles (11.910 km) with the addition of the Lindsay Hairpin. For the 1953 racing season the Clady Circuit was abandoned for motor-cycle racing and the Ulster Grand Prix as part of the FIMMotorcycle Grand Prix World Championship and was moved to the nearby Dundrod Circuit in Co Antrim. The circuit comprised public roads closed for racing including a section of the secondary B38 Hannahstown Road between Glenavy and Hannahstown, Co Antrim, the secondary B101 Leathemstown Road from Leathemstown Corner to Dundrod and the B153 Quarterland/Tornagrough Road from Cochranstown to the road junction of the B38 Upper Springsfield Road/Hannahstown Road at the Lindsay Hairpin.
The lap record for the Dundrod Circuit is 3 minutes and 18.870 seconds at an average speed of 133.977 mph set by Bruce Anstey riding a 1000 cc Suzuki during the 2010 Ulster Grand Prix. The race record for the Dundrod Circuit is an average speed of 132.029 mph also set by Bruce Anstey during the 2010 Ulster Grand Prix.
The lap record for the RAC Tourist Trophy on the Dundrod Circuit is 4 minutes and 42 seconds at an average speed of 94.67 mph (152.3582 km/h) held by Mike Hawthorn driving a Jaguar D-Type set during the 1955 RAC Tourist Tophy. The race record for the RAC Tourist Trophy on the Dundrod Circuit is 7 hours, 3 minutes and 12 seconds an average speed of 88.32 mph (142.139 km) for 84 laps (622.96 miles/1002.518 km) during the 1955 RAC Tourist Trophy race held by the works Daimler-Benz entry of Stirling Moss/John Fitch driving a Mercedes-Benz 300 SLR.