Tour of the
Dragon

The Race in Detail

Why the Tour of the Dragon Is the World’s Hardest One-Day Race

The case is straightforward. Paris–Roubaix — the Hell of the North, the most celebrated one-day race in professional cycling — is 265km with a maximum elevation of 685m. The Tour of the Dragon is 268km with a starting elevation of 2,610m, a maximum elevation of 3,340m, and a total elevation gain of 3,790 metres. The highest point of the entire Paris–Roubaix route is lower than the base camp of the Tour of the Dragon. The American Death Ride — the hardest one-day event in US cycling — reaches 2,660m over 206km. The Tour of the Dragon starts higher and goes further.

Add in the altitude factor: at 2,700–3,340m, oxygen levels are approximately 73–76% of what they are at sea level. Riders accustomed to European or American conditions are working considerably harder for every pedal stroke from the very beginning. Altitude sickness, hyponatraemia, and hypoglycaemia are real risks over a 10–15 hour race at these elevations. The September timing means residual monsoon weather is likely — rain, fog, and road deterioration are all built into the planning.

The Full Route — Section by Section

Start: Bumthang (2,610m), 2am. The race begins before dawn. The first section follows the Bumthang Chhu river before a 6km climb through blue pine forest to Kiki La at 2,870m. Descent to Nangar, then a rolling section through the Chumey Valley and up to Gaytsha (2,950m). The landscape here is Bumthang at its most beautiful: wide agricultural valleys, prayer flags on every ridge, the monasteries of the Chumey Valley visible below.

Trongsa (1,900m), approximately 80km. The road descends dramatically to Trongsa, where Trongsa Dzong — the largest dzong in Bhutan and the ancestral seat of the Wangchuck dynasty — commands the valley from its ridge. The descent into the Mangde Chhu gorge is steep and technical. From Trongsa, the road climbs again toward Pele La.

Pele La Pass (3,420m), approximately 120km. The highest point on the route. Pele La marks the border between eastern and western Bhutan. The ascent from Trongsa is long and gradual; the descent toward Wangdue is faster. The pass is often in cloud; views of Gangkar Puensum and the Bhutanese Himalayan chain are possible on clear days.

Wangdue Phodrang (1,200m), approximately 180km. The lowest point of the route, at the confluence of the Punatsang Chhu and Dang Chhu rivers. Riders arrive here after the long descent from Pele La. The climb back up toward Dochula begins immediately.

Dochula Pass (3,100m), approximately 245km. The final major climb and the psychological crux of the race. After 245km of riding, participants must ascend to 3,100m. The 108 Druk Wangyal Chortens at the top mark the passage. From here, the road descends 22km to Thimphu.

Finish: Thimphu (2,320m), 268km. The race finishes in Bhutan’s capital. The winner is received by the president of the Bhutan Olympic Committee. Finishers receive a certificate and a cash prize; the window between first and the cut-off spans many hours.

Practical Information for Race Participants

• Registration — Pre-registration is essential and numbers are limited. Contact Found Bhutan well in advance for current registration details and entry requirements.
• Arrival — Arrive in Bhutan at least 3–5 days before the race to acclimatise to altitude. Bumthang at 2,610m is significantly higher than most participants’ training altitude.
• Support vehicle — All participants are required to have a support vehicle with a mechanic and emergency supplies following the route. Found Bhutan provides this as part of the race package.
• Bike — A high-quality mountain bike with reliable brakes and gearing is essential. Road surfaces vary from good tarmac to deteriorated monsoon-damaged sections.
• Nutrition — Pre-positioned feeding stations exist along the route, but carrying additional energy gels and electrolytes is recommended for a 10–15 hour effort at altitude.
• Cut-off time — There is a strict race cut-off. Riders who miss the cut-off at checkpoints are removed from the race. Plan training and pacing accordingly.
• Visa and SDF — All international participants require a Bhutan visa and Sustainable Development Fee. Found Bhutan handles all of this as part of the race package.