Seriously Brutal Duathlon
September 20th 2025
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)…
Distances/routes to follow…
Take on the Canol (Half/middle)…
1 lap around the Lake (5m), 2 lap (58m) 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)
Entry fees:
10% off until Jan 31st
Seriously Brutal Bach (Standard) - £70
Seriously Brutal Bach (Standard) Team - £90
Seriously Brutal Canol (Half/middle) - £135
Seriously Brutal Canol Team (Half/middle) - £170
Seriously Brutal Mawr (Full/big) - £240
Seriously Brutal Mawr Team (Full/big) - £300
Teams involve each person completing ONE discipline each.
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 then 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 mountain bag kit check) is open from 16:00 till 20:00
What time is race briefing on Friday?
The Duathlon briefing is at 18:00
Where is 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)
Will I be given transition bags?
No, but you will be given numbered tags to attach to your own bags
Do I rack my bike on Friday?
There is NO bike racking available on Friday night. This is because of security / staffing issues
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 20th September 2025
Will there be food / drinks on site?
Yes, there is a catering van open all weekend
What will be available at the aid stations?
Torq Sports Nutrition, flapjack, cheese scones, bananas, biscuits, jellybabies, water, coke and flap jack.
Where are the aid stations?
One on the bike (mile 14) One on the run (2.5 mile approx) and one at HQ
What happens before I start the mountain section?
Before you head off to Yr Wyddfa (Snowdon), you will be required to check in with a medic to ensure that you are fit and well enough to climb up and back down a mountain. This check is essential but will not take more than a minute
Where can I stay?
There are plenty of B&Bs, hotels, campsites and bunkhouses available near race HQ. It is advisory to book early as Llanberis is a small village and it gets full very quickly
Are there showers in transition?
No, only portable toilets.
What are the rules?
Hi-viz vest to be worn on the bike AT ALL TIMES, failure to abide by this, and you will be withdrawn from the race (For all athletes on every distance). No drafting. You must wear a cycle helmet. No MP3 players or similar. No littering and you must mount and dismount at the designated points.
Trophies
There will be trophies awarded to the 1st, 2nd and 3rd male / female in all races.
Dinorwac Power Station works
We are aware of the planned works at Dinorwac Power Station over the next few years, but anticipate this will not impact on the race too much. Please be assured we will keep up to date with developments there.
The Run Course
The Lake Lap is a 5 mile course and you will run as many laps as required, depending on your chosen distance.
The Bike Course
The Brutal Triathlon bike is on open roads. It is a 28 mile course and you will bike as many laps as required, depending on your chosen distance.
The Mountain Section
The Yr Wyddfa (Snowdon) route follows the Llanberis Path and is aprox 9 miles, up and down.
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 after start of race
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 after start of race
Kit list: (all races)
Athlete
(all athletes need these items)
Issued map (waterproof pouch / bag needed)
Compass
Whistle
Waterproof coat
Waterproof trousers
Extra warm clothes
Gloves
Hat
Nutrition
A fully charged working mobile phone (water proofed) with 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 other drink
Blister kit