Four Inch Course

Motorsport venue
Name = Four-Inch Course | Location = Douglas, Isle of Man
Time = GMT


Events = Tourist Trophy
Length_km = 60.39
Length_mi = 37.5
Turns = 220+
Record_time = 1 hour 32 mins, 32.2 sec (57.70 mph)
Record_driver = Major Henry Seagrave
Record_team = Sunbeam
Record_year = 1922

Four-Inch Course ["TT Pioneers - Early Car Racing in the Isle of Man" pp 103-104 Robert Kelly, Mercury Asset Management (1996)(1st Edition) The Manx Experience, The Alden Press ISBN No 1 873120 61 3] is a road-racing circuit first used for the 1908 Tourist Trophy Race for racing automobiles. The racing was held on public roads closed for racing by an Act of Tynwald (the parliament of the Isle of Man). The name of the course derives from the regulations for the 1908 Tourist Trophy adopted by the Royal Automobile Club which limited the the engines of the competiting automobiles to an cylinder diameter of four-inches. The Four-Inch Course was adopted by the Auto-Cycle Club for the 1911 Isle of Man TT Races. The Four-Inch Course was subsquently known as the Snaefell mountain course or Mountain Course when used for motor-cycle racing.

Four-Inch Course

The new course was a length of 37.5 miles and was based on the 'Short' Highlands Course with the omission of the "Sandygate Loop" and the "Peel Loop." The start was moved from the road junction of the A2 Quarterbridge Road/Alexander Drive to Hillberry Corner on the A18 Mountain Road. The Four-Inch Course is based on a number of public roads in the Isle of Man closed for racing including the primary A1 Douglas to Peel Road to Ballacraine Corner and the A3 Castletown to Ramsey Road. The A9 Albert Road in the town of Ramsey, including a section of private road and the primary A18 Mountain Road to the road junction with the A21 Road and C10 Scholag Road at Cronk-ny-Mona in Douglas. The primary A21 Johnny Watterson Lane, the A22 Ballanard Road, A2 Bray Hill and the A2 Quarterbridge Road in Douglas.

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