The Brutal Extreme Triathlons

SEP
19-22
2026
Multi-lap triathlon in Llanberis with lake swims in Llyn Padarn, multiple 28 mile bike laps and a mountain run up and down Yr Wyddfa.
19-22 Sep 2026
678 kilometers 452 kilometers 226 kilometers 113 kilometers 52 kilometers

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The Brutal Extreme Triathlon

The Brutal Extreme Triathlon takes place on September 19th 2026 in Llanberis, North Wales. The event uses Llyn Padarn for the swim, public roads for the bike, and the Llanberis Path up and down Yr Wyddfa (Snowdon) for the mountain section.

Distances offered include:

  • Brutal Bach (Standard)
  • Canol (Half)
  • Mawr (Full)
  • Cawr (Double)
  • Goron (Triple) All distances can be entered solo or as a team of two to four members.

The swim is held in Llyn Padarn with laps in cold water; typical lake temperatures are 16 to 18 degrees Celsius. Competitors exit the lake every two laps and can access a basic lakeside aid point with hot drinks and snacks.

The bike uses an approximately 28 mile lap on open roads. The route includes a steep climb over Pen y Pass and fast descents back toward the event field. Weather can vary locally, so riders should be prepared for wind and rain on parts of the course.

The run comprises a 5 mile lake lap and a mountain section of about nine miles up and down Yr Wyddfa via the Llanberis Path. For Double and Triple entrants the mountain section is completed before the lake laps for safety.

Support crews are required for Double races and recommended for night sections; they must follow specific safety rules and attend the briefing for Double and Triple events. A mandatory kit list covers navigation and mountain safety items. Aid stations provide sports nutrition, snacks, water and soft drinks. Trophies are awarded to the first three male and female finishers in each race. Visit the organization's website for the most recent information.

678 km
Triple Brutal
452 km
Double Brutal
226 km
The Brutal Mawr (full)
113 km
The Brutal Canol (half)
52 km
The Brutal Bach (standard)
Seriously Brutal Bach Duathlon

Events nearby

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A multi day 286 km mountain race across Wales with solo and team entries, five indoor checkpoints and a 108 hours time limit.
A fully waymarked, supported Sea to Summit ultramarathon from Caernarfon Castle to Yr Wyddfa covering 29 miles and over 5600 ft of ascent on 26 September 2026.
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