Wikipedia
This series of bends was part of the Highland Course and Four Inch Course used for the Gordon Bennett Trial and the Tourist Trophy car races held between 1904 and 1922. Rhencullen is part of the Snaefell Mountain Course used since 1911 for the TT and Manx Grand Prix races.
The area is dominated by the farmland at Ballarhenny and the manse of Bishopscourt, including Birkin's Bend, Cloudy Lane and Rhencullen Hill. During an early morning practice session for the 1927 TT, Archie Birkin swerved to avoid a fish-van travelling to Peel and crashed fatally. The corner at Rhencullen on the A3 road where the accident occurred was named as 'Birkins Bend'. From 1928 onwards, practice sessions for the TT races and Manx Grand Prix were held on closed-roads.
The Rhencullen complex of bends including Birkin's Bend was subjected to road widening and reprofiling during the winter of 1953/1954 for the 1954 TT races.