Isle of Man TT: The Snaefell Mountain Course

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

A photographic record of the course and its corners, assembled over two decades of race coverage, is held at the Snaefell Mountain Course length archive, which documents viewpoints from Bray Hill to the Grandstand. The archive covers the period from 2004 to 2025 and lists galleries by corner, rider and year. The Snaefell Mountain Course measures 37.73 miles. The start and finish line is on Glencrutchery Road in Douglas, close to the Grandstand and the paddock. From there the course runs out through the town, over Bray Hill, and into the western parishes before turning north and east around Snaefell, the island's highest mountain. The lap is not a closed circuit in the usual sense. It uses the A2, A3 and A18 roads, along with a number of village streets, and the roads are open to traffic for the rest of the year. Race organisers close them for practice and race sessions, and the course is marshalled by volunteers at hundreds of points. A lap takes a top rider around 17 minutes at racing speed. The outright lap record stands at 135.452 mph, set by Peter Hickman in 2018 on a BMW, which works out at just under 16 minutes 42 seconds for the 37.73 miles. Average speeds on the course have risen steadily since the first TT on the mountain circuit, when riders were on machines with far less power and far worse brakes.

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

The course has more than thirty named points, most of them corners, bridges or junctions. They run in order from the start: - Bray Hill, the steep descent out of Douglas - Quarter Bridge, a tight left at the bottom of the hill - Braddan Bridge, a right-left flick under a church and a bridge - Union Mills, a village straight - Ballacraine, a right-hander onto the Peel road - Glen Helen, a series of bends in a wooded valley - Kirk Michael, a village straight with a wall on both sides - Ballaugh Bridge, a hump-backed bridge taken at speed - Sulby Straight, the longest straight on the course - Sulby Glen, a left at the end of the straight - Ramsey Hairpin, the tightest corner on the circuit - Waterworks, a climb out of Ramsey - Gooseneck, a downhill double bend - The Bungalow, the highest point, at around 1,300 feet - Windy Corner, exposed and often gusty - Keppel Gate, a left on the mountain section - Kate's Cottage, a right-hander near a stone cottage - Creg-ny-Baa, a pub corner with a steep approach - Hillberry, a fast right onto the Cronk ny Mona road - Signpost Corner, a left before the descent into Douglas - Governor's Bridge, the final corner before the finish - The Grandstand, the finish line and paddock Each name marks a change in the character of the road. Some are fast and open, like Sulby Straight and Hillberry. Others are slow and technical, like Ramsey Hairpin and Quarter Bridge. The list is not fixed in stone: marshals, riders and spectators use local names for smaller bends that do not appear on official maps.

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

Bray Hill is the first serious test of a lap. It drops steeply from the outskirts of Douglas toward Quarter Bridge, and riders arrive at it at full throttle from the start line. The road falls away faster than it looks on camera, and the surface is public road, not track. A rider who gets the entry wrong has very little room to correct before the left at Quarter Bridge. What makes Bray Hill notable is the combination of speed, gradient and the fact that it is the first corner of the race. There is no warm-up lap. Riders leave the Grandstand, accelerate through the gears, and are on the descent within seconds. Photographers have used the spot for decades because the compression of the suspension and the angle of the machines are visible from the pavement. The corner has also been the site of serious incidents, which is part of why it is discussed so often. It sets the tone for the lap: a rider who is fast at Bray Hill is usually fast everywhere else on the course. The same is true in reverse.

Where does the course go after Bray Hill?

After Bray Hill the course runs through Quarter Bridge, Braddan Bridge and Union Mills, then turns west at Ballacraine. It follows the Peel road to Glen Helen, where the bends run through a wooded valley, then continues north through Kirk Michael and Ballaugh. Ballaugh Bridge is a hump-backed bridge that riders take at speed, and it leads onto Sulby Straight, the longest straight on the circuit. At the end of Sulby Straight the course turns left at Sulby Glen and runs into Ramsey. Ramsey Hairpin is the tightest corner on the course, and it is followed by the climb at Waterworks. From there the road rises to the Gooseneck, then to the Bungalow, the highest point of the lap. The mountain section runs across open moorland past Windy Corner, Keppel Gate and Kate's Cottage, then drops to Creg-ny-Baa, Hillberry and Signpost Corner. Governor's Bridge is the last corner, and the finish is on Glencrutchery Road.

How is the course used outside race week?

The Snaefell Mountain Course is made of public roads. For most of the year the A2, A3 and A18 carry ordinary traffic, and the named corners are junctions, bridges and village streets that residents use daily. The TT and the Manx Grand Prix, now called the Manx Grand Prix, are the periods when the roads close. Practice sessions usually run in the late afternoon and evening, and race days are held during the day. The closure order covers the whole 37.73 miles, and marshals are posted at every corner and access point. Outside those windows, the same roads are open, and the mountain section can be driven or ridden at normal road speeds. The course has been measured and mapped many times, and the 37.73-mile figure has been the standard since the early years of the mountain circuit. It is one of the longest closed-road race circuits in the world, and the only one of its kind still used for a major international event. The Snaefell Mountain Course is read the same way: on foot, before the racing line is committed to memory. Walk the 37.73 miles once and the surface tells you where the bike will be light, where the stone walls leave no room, and where the road falls away past the Verandah. That habit of reading a course before riding it carries over to dirt, where the same discipline applies to a closed loop of private property. The method is set out in reading a motocross track, which treats braking marks, ruts and berms as the readable record of everyone who has ridden there before.

For the next step, compare this note with Fly Fishing Notes, Fly Fishing, How to Read a River, River Conservation and Fly Fishing Contact. Each link keeps the same question in view while opening a different part of the river.