What is the length of the Snaefell Mountain Course?

What is the length of the Snaefell Mountain Course? The answer is 37.73 miles.

The Snaefell Mountain Course measures 37.73 miles, or approximately 60.72 kilometres. It is the road circuit used for the Isle of Man TT and other major motorcycle events on the Isle of Man.

Unlike a permanent racing circuit, the course uses public roads that are closed for competition. The route begins on Glencrutchery Road in Douglas, climbs through towns and mountain sections, and completes a lap through a mixture of urban streets, open countryside, and high-speed rural roads.

The course is also known as the TT Mountain Course or simply the TT Course. Its famously challenging layout includes 219 corners, changing elevations, jumps, walls, hedges, and very limited run-off. Riders therefore race against both the clock and an unforgiving environment.

The length is sometimes rounded to 37.7 miles or reported in kilometres, but 37.73 miles is the standard published figure. It should not be confused with a modern purpose-built circuit: the TT Course remains a public-road course outside race closures.