September 19th 2026
Llanberis, North Wales
Take on the World’s hardest Duathlon…
This event runs alongside the Brutal Triathlons, allowing you to experience the exciting and challenging routes, without having to swim!
You start with the surprisingly tough lake lap run, followed by the awesome (and hilly) bike course and finally up and down Yr Wyddfa (Snowdon)
The distances available are Standard, Half and Full (Bach, Canol and Mawr). You can enter all of these events as a solo or in a team (2 – 4 members)
Pick your distance
Take on the Bach (Standard)
1 lap around the Bach short run loop (2.3m), 1 lap (29m) road bike and finish with an ascent/descent of Yr Wyddfa (Snowdon) (9m)
Take on the Canol (Half/middle)
1 lap around the Lake (5m), 2 laps (58m) on a road bike and finish with an ascent/descent of Yr Wyddfa (Snowdon) (9m)
Step up to the Mawr (Full/big)
3 laps around the Lake (15m), 4 lap (116m) road bike and finish with an ascent/descent of Yr Wyddfa (Snowdon) (9m)
Cut offs:
Standard & Half cut-offs
- Lake lap – 1.5 hours after start of race
- Exit transition from bike to Yr Wyddfa (Snowdon) – 6.5 hours after start of race
- Overall cut off – 14 hours
Full cut-offs
- Lake laps – 5 hours after start of race
- Exit transition from bike to Yr Wyddfa (Snowdon) – 15 hours after start of race
- Overall cut off – 21 hours
Course information
Run
The lap around the lake comes as a shock to first-timers. Don’t be fooled by the description, there are plenty of hills, trails, rocks and even a waterfall to test you.
Bike
The 28-mile bike lap will certainly test you with a steep, sharp hill to start with. Then you can enjoy the stunning views and undulating course until you reach the well-known beast of a climb over Pen y Pass and super-fast descent back to HQ.
Mountain
Yr Wyddfa (Snowdon) is Wales’s highest mountain, and for this event you follow the Llanberis Path, which is a clear, well-defined path. And if you are very lucky, you may get to experience some amazing views from the summit.
FAQs:
What time is registration on Friday?
Registration (which will include a mountain bag kit check) is open from 16:00 till 20:00
What time is the race briefing on Friday?
The Duathlon briefing is at 18:00
Where is the registration/briefing on Friday?
In the main marquee on the event field (please do NOT bring your transition bags until the morning of the race)
What time is transition open on race day?
From 05:00
What time/day does the race start?
All races start at 07:00 Saturday, 19th September 2026
Will there be food/drinks on site?
Yes, there is a catering van open all weekend
Aid Stations
- Torq Sports Nutrition
- Flapjack
- Cheese scones
- Bananas
- Biscuits
- Jellybabies
- Water
- Coke
Kit list: (all races)
- Issued map (waterproof pouch/bag needed)
- Compass
- Whistle
- Waterproof coat
- Waterproof trousers
- Extra warm clothes
- Gloves
- Hat
- Nutrition
- A fully charged working mobile phone (waterproof) with the emergency number in
- Glow sticks or red tail light (Full/double / Triple only)
- Survival foil blanket
- Head torch (Full/double / Triple only)
- More than 400ml of water or another drink
- Blister kit