The Brutal Extreme Triathlons

SEP
19-22
2026
A multi distance triathlon in Llanberis combining lake swims, repeated open road bike laps and lake plus mountain runs on the Llanberis Path. Double and Triple entrants must use support crews for night and mountain sections.
19-22 Sep 2026
422 miles 281 miles 141 miles 70 miles

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The Brutal Extreme Triathlons

The Brutal Extreme Triathlons take place in Llanberis, North Wales, with swim, bike and run sections around Llyn Padarn and a mountain section on Yr Wyddfa (Snowdon) via the Llanberis Path. The event offers multiple distance options and can be entered solo or as a team of 2 to 4.

Available distances

  • Canol (Half): 1.2 mile lake swim, 56 mile bike, 5 mile lake lap plus Yr Wyddfa.
  • Mawr (Full): 2.4 mile lake swim, 112 mile bike, 15 mile lake laps plus Yr Wyddfa.
  • Cawr (Double): multiple laps of swim, bike and mountain, support crew required.
  • Goron (Triple): extended multiple laps of all sections, support crew required.

Course details note that the swim uses laps in Llyn Padarn with lakeside aid and places to leave shoes. The bike uses an open road 28 mile lap with steep climbs including Pen y Pass and exposed weather conditions. The lake lap is about 5 miles and the mountain section is approximately 9 miles up and down the Llanberis Path. For the Double and Triple the mountain section is completed before lake laps for safety reasons.

Cutoffs and specific exit times apply per distance and athletes must meet these. Mandatory rules include wearing a hi viz vest on the bike at all times, helmet use, no drafting and no MP3 devices. Aid stations provide basic food and drink. A kit list and support crew requirements are specified for each race category. Visit the organization's website for the most recent information.

422 mi
Brutal Goron (triple Brutal)
281 mi
Brutal Cawr (double Brutal)
141 mi
Brutal Mawr (full Brutal)
70 mi
Brutal Canol (half Brutal)
Brutal Bach (standard)
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