ATW Centurion 100km Triathlon Box End

MAY
24
2026
Take on the ATW Centurion 100 km triathlon at Box End Lakes, Bedford on 24 May 2026, with a lake swim, scenic road bike and off road run. Aquabike and relay entries available, plus onsite camping, parking and a custom medal for finishers.
Sun 24 May 2026
Standard Triathlon (1.5k... Sprint Triathlon (750m Sw... Metric Centurion 100km Aquabike Relay (2 or 3 Participant...

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Event overview

The ATW Centurion 100KM Triathlon takes place at Box End Lakes, Bedford (MK43 8RN) on 24 May 2026. The Metric Centurion is a 100 km triathlon that combines a lake swim, a road bike leg, and an offroad run. The bike leg is non-draft legal. Aquabike and relay options are available, with relays possible for two or three people sharing the disciplines.

Event services include free parking at Box End Lakes and on-site camping at Box End Park. The event provides course marshals, course markings, free event photos, a custom medal, and finish-line snacks. The event lists Alzheimer’s Research UK as a charity partner.

Race distances, cutoffs and entry policy

  • Metric Centurion - 2.2 km swim, 81 km bike, 20 km run
  • Standard Triathlon - 1.5 km swim, 40 km bike, 10 km run
  • Sprint Triathlon - 750 m swim, 26 km bike, 5 km run

Swim cut-off is 2:30 - most participants finish the swim in under 1:10. Bike cut-off is 6:30 from race start - most complete the bike in about 3:00. Final race cut-off is 8:30 from race start - typical run time is around 2:30. ATW does not offer refunds or transfers to another person; entries can be transferred to another ATW event up to 48 hours before the event. Visit the organization's website for the most recent information.

100 km
Metric Centurion 100km
26 km
Sprint Triathlon (750m Swim, 26k Bike, 5k Run)
Standard Triathlon (1.5k Swim, 40k Bike, 10k Run)
Aquabike
Relay (2 or 3 Participants)

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