The Snaefell Mountain Course: A Rider's Map

How long is the Isle of Man TT course and where does it start?

The Isle of Man TT course is the Snaefell Mountain Course, a 37.73 mile (60.72 km) loop of closed public roads. It starts on Glencrutchery Road in Douglas and runs clockwise. No lap is short: the course climbs over the mountain, drops into the west of the island, and returns to the same suburban street it left. The Snaefell Mountain Course measures 37.73 miles, or 60.72 kilometres. It is not a purpose-built circuit. It is a set of public roads in the Isle of Man, closed for practice and racing, and it has been used in this form since the course moved to the mountain in 1911. The start and finish line sits on Glencrutchery Road in Douglas, close to the Grandstand. Riders leave in the direction of Bray Hill, which means the first thing a competitor meets is a fast descent into a residential street, not a long straight. The lap runs clockwise. From Douglas it heads west and north, crosses the mountain section, and comes back into Douglas from the north through Signpost Corner and Governor's Bridge. Because the roads are public the rest of the year, the course has no permanent kerbs, no run-off built for racing, and no gravel traps of the kind found on closed circuits. Walls, hedges, poles, and garden gates sit where a circuit would place asphalt. That is the single most important fact about the place, and it shapes every corner on the list below.

What are the named corners of the Isle of Man TT course?

The course has a long list of named points. They are not all corners in the racing sense. Some are bridges, some are junctions, some are bends that only earn a name because of what happens there. In order from the start, the main named points include Bray Hill, Quarter Bridge, Braddan Bridge, Union Mills, Ballacraine, Glen Helen, Kirk Michael, Ballaugh Bridge, Sulby Bridge, Sulby Straight, Ramsey Hairpin, Waterworks, Gooseneck, the Bungalow, Windy Corner, Keppel Gate, Kate's Cottage, Creg-ny-Baa, Hillberry, Signpost Corner, Governor's Bridge, and the Grandstand. A few of these carry more weight than the rest. Quarter Bridge is an early right-hander that arrives while the tyres are still cold. Ballaugh Bridge is a jump, taken in the middle of a village. Ramsey Hairpin is the slowest point on the lap and the place where the course turns back on itself. The Bungalow is the high point of the mountain section, near the Snaefell Mountain Railway. Creg-ny-Baa is a pub and a corner, and it is one of the most photographed places on the island. The names matter for a practical reason. They are how marshals, commentators, and riders describe position on a 37.73 mile lap. Saying "past Ballaugh" or "through the Gooseneck" is more precise than giving a mile marker, and it is the vocabulary the course has used for decades.

That figure, 37.73 miles, is the number most spectators carry in their heads. It is also the number that makes the rest of the course make sense, because everything else, the named corners, the elevation, the length of a lap, follows from it. A useful reference for the Snaefell Mountain Course length and its layout is kept by The Snaefell Review, an independent magazine on the TT and the mountain course.

Another route read for surface and traffic is in a bike commute plan.

Why is Bray Hill famous at the Isle of Man TT?

Bray Hill is famous because it is the first serious test of a lap, and because it is taken at speed on a road that was built for ordinary traffic. Riders leave the start line and immediately drop down Bray Hill. The road falls away steeply, and the suspension is loaded hard at the bottom. Machines have been known to bottom out, and the compression at the base of the hill is part of TT folklore. What makes it notable is not the corner itself but the combination: full fuel load, cold tyres, a downhill approach, and a stone wall on either side. It is also the first place many spectators see a TT bike at close range. Bray Hill is within walking distance of the Grandstand and Douglas town centre, which makes it one of the busiest viewing points on the course. For a rider, it sets the tone. A lap that goes wrong at Bray Hill is a long 37.73 miles.

What does a lap of the course actually contain?

A lap can be divided into three broad parts. The first runs from the Grandstand to Ballacraine, through Bray Hill, Quarter Bridge, Braddan Bridge, and Union Mills. It is the built-up section, with houses, walls, and short sight lines. It is also where the field is still bunched. The second runs from Ballacraine through Glen Helen, Kirk Michael, Ballaugh, Sulby, and up to Ramsey. This is the west and north of the island, faster and more open in places, with the Sulby Straight among the quickest stretches on the course. Ballaugh Bridge and Sulby Bridge are the two named jumps most often discussed. The third is the mountain section: Ramsey Hairpin, Waterworks, the Gooseneck, the Bungalow, Windy Corner, Keppel Gate, Kate's Cottage, and Creg-ny-Baa, before the return to Douglas through Hillberry, Signpost Corner, and Governor's Bridge. This part carries the elevation. The course climbs to the Bungalow and then descends toward Creg-ny-Baa, and the weather here can differ from the weather in Douglas on the same afternoon.

How do the races use the course?

The Tourist Trophy has been run since 1907, and the Manx Grand Prix since 1923. The Classic TT is a later addition to the island's racing calendar. The course is the same for all of them, but the classes differ. Superbike and Superstock machines are the fastest over a lap. Supersport and Sportbike classes run smaller capacity machines. Sidecars run on the same roads with a passenger, and their lines through the named corners differ from those of solo machines. The Senior TT is the headline race of the fortnight and is traditionally the last major solo event of the meeting. The fortnight itself has a shape. Practice and qualifying sessions come first, held in the evenings on closed roads, and then race week follows. Road closures are part of the schedule, and they affect anyone travelling on the island, not only spectators at the course.

What should a first-time spectator know about the course?

The course is not a stadium. There is no single ticket that puts a spectator in front of every corner, and moving between points takes time because the roads are closed while sessions run. Most first visits combine two or three viewing points rather than trying to see everything. Bray Hill and the Grandstand area are the easiest to reach from Douglas. Ballaugh Bridge, Sulby, and Ramsey Hairpin sit in the north. The Bungalow and Creg-ny-Baa are on the mountain section and are exposed to the weather. Photographically, the course rewards patience. The light on the mountain changes quickly, and the named corners give a photographer a fixed subject with a known approach line. The Snaefell Review covers the course, the races, and the practical side of watching and photographing road racing, and it is independent of any promoter, club, or media organisation. The short answer to the original questions: the course is 37.73 miles, it starts on Glencrutchery Road in Douglas, it runs clockwise, it has several dozen named points, and Bray Hill is famous because it is the first fast descent of every lap, taken on a public road with cold tyres and a full tank.