The Dundrod Circuit in Co Antrim, first used in 1950 for the RAC Tourist Trophyautomobile race and the Formula One Ulster Trophy, was in length and later amended for the 1965 racing season to 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. After 1955 cars stopped racing there due to no less than 3 fatalities during the 1955 TT race and safety concerns with the narrow, high-speed nature of the circuit, and since then it has only been used for motorcycle racing. The photo below shows the original much tighter hairpin, with the modern hairpin, known now as the Lindsay Hairpin, being slightly further back up the road.
The lap record for the Dundrod Circuit is 3 minutes and 15.316 seconds at an average speed of set by Peter Hickman riding a BMW during the 2019 Ulster Grand Prix bringing back the title of The World's Fastest Road Race to the Dundrod Circuit The race record for the Dundrod Circuit is an average speed of set by Bruce Anstey during the 2017 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 held by Mike Hawthorn driving a Jaguar D-Type set during the 1955 RAC Tourist Trophy. 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 for 84 laps 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. The 1971 Ulster Grand Prix held on the Dundrod Circuit was won by Australian Jack Findlay in what was the Ulster Grand Prix's last year as part of the FIM Grand Prix international motorcycle racing calendar. Findlay's victory on a Suzuki was also notable for marking the first 500cc class win for a motorcycle powered by a two stroke engine.
